Oppo F1s Android 11 Update Download Updated May 2026

Title: The Reality of the Android 11 Update for the Oppo F1s: A User’s Guide

The Oppo F1s, released in 2016, earned a reputation as a "Selfie Expert" with its robust build and reliable performance for the mid-range market. Years later, many users are still holding onto these devices due to their durability. Consequently, a common search query persists across tech forums and search engines: "Oppo F1s Android 11 update download." Users hoping to breathe new life into their aging devices by installing the latest operating system, however, are often met with disappointment. Understanding the technical limitations of the hardware versus the demands of modern software is crucial for users seeking this update.

To address the core question directly: there is no official Android 11 update available for the Oppo F1s. When the F1s was launched, it shipped with Android 5.1 Lollipop (or Android 6.0 Marshmallow depending on the region). Oppo provided updates up to Android 6.0 Marshmallow for most variants via their ColorOS skin. However, smartphone manufacturers typically support devices for two to three years. As the Oppo F1s is now several generations old, it has reached its "End of Life" (EOL) status regarding software support. The hardware architecture of the F1s—specifically the MediaTek MT6750 processor and the limited RAM configurations—was optimized for the software ecosystem of 2016, making it ill-equipped to handle the resource-intensive architecture of Android 11.

For users desperate to experience Android 11 on this device, the only viable path is through custom ROMs. Custom ROMs are aftermarket firmware distributions developed by third-party enthusiasts. A user searching for a download might find ports or custom builds on platforms like XDA Developers. However, this route is fraught with risks. Installing a custom ROM requires unlocking the bootloader, which voids the warranty and can brick the device if done incorrectly. Furthermore, these unofficial Android 11 ports for the F1s are often unstable; users may face non-functional cameras, broken GPS, or severe battery drain. For the average user, the trade-off between having a newer interface and having a stable daily driver is rarely worth it.

The persistence of the search for an Android 11 download highlights a broader issue in the consumer electronics market: the desire for software longevity. While Oppo has moved on to support newer models like the F17 and F19 series with updated software, the legacy of the F1s remains tied to its original software constraints. Users attempting to download "Android 11" from unverified websites pose a significant security risk to themselves. Malicious actors often disguise malware as "OS update files" to trick owners of older phones into installing viruses.

In conclusion, the search for an Oppo F1s Android 11 update is ultimately a search for a software build that does not officially exist. While the device served users well during its prime, the technological gap between 2016 hardware and 2021 software is too wide to bridge officially. Users are advised to stick to the final official updates provided by Oppo to ensure device stability, or consider upgrading to a newer handset if the features of Android 11 are a necessity.

Official updates for the Go to product viewer dialog for this item.

(released in 2016) stopped at Android 6.0 (Marshmallow). There is no official Android 11 update available for this device due to its aging hardware.

To get Android 11, you would need to use a Custom ROM (like LineageOS or Pixel Experience), which is an advanced process that carries risks, such as voiding your warranty or "bricking" your phone. Step 1: Check for Final Official Updates

Before trying unofficial methods, ensure you have the last official stable version: Open Settings on your phone. Select Software Update (or About Phone > System Updates).

If an update to Android 6.0/ColorOS 3.0 is available, follow the on-screen prompts to download and install it. Step 2: Guide for Unofficial Android 11 (Custom ROM)

If you choose to proceed with a custom ROM to reach Android 11, follow these general steps. Note: Specific files must be sourced from reputable developer communities like XDA Developers. How do I want to upgrade my Oppo F1 s?

, released in 2016, does not have an official Android 11 update. The device officially peaked at Android 6.0 Marshmallow

(ColorOS 3.0), which remains the highest stable version supported by the manufacturer.

While there is no official download for Android 11, users typically look to Custom ROMs to bring newer software to this legacy device. Official Update Status originally launched with Android 5.1 Lollipop Latest Official Version : Android 6.0 Marshmallow. Update Method : Most users can find this update via Settings > System Updates or by downloading the official firmware from the OPPO Support Page Android 11 via Custom ROMs (Unofficial)

Because OPPO officially stopped support years ago, Android 11 can only be achieved through community-developed firmware like AOSP-based ROMs

The Go to product viewer dialog for this item. does not have an official Android 11 update. This device, released in 2016, originally ran Android 5.1 (Lollipop) and only officially supports up to Android 6.0 (Marshmallow).

If you see sites offering "Android 11 official firmware" for this specific model, they are likely misleading or providing Custom ROMs, which are unofficial and require technical expertise to install. Official Update Path (Max Support)

The highest official version you can reach is Android 6.0. To check if you have the final version: Open Settings. Scroll to and select System updates or Software update.

The phone will automatically check for any remaining official patches. Unofficial Options (Android 11 Custom ROMs)

To get Android 11, you must use unofficial software like LineageOS or AOSP-based ROMs.

Requirements: You must unlock your bootloader and install a custom recovery like TWRP.

Risks: This process can "brick" your phone (make it unusable), voids your warranty, and may have bugs like non-working cameras or fingerprint sensors.

Resources: You can find community-built ROMs on forums like XDA Developers or Reddit. Important Considerations how to update my oppo f1s android version 5.1 to 6

The Oppo F1s does not have an official Android 11 update. The device, originally released with Android 5.1 (Lollipop), officially supports updates only up to Android 6.0 (Marshmallow). Official Support Status

Android 11 Availability: There is no official Android 11 firmware for this model. Last Official Version: Android 6.0 (Marshmallow).

Manufacturer Stance: OPPO has discontinued major software support for the F1s, meaning newer versions like Android 7, 8, or 11 will not be released through official channels. Alternative: Custom ROMs

If you want to run Android 11 on an Oppo F1s, your only option is to use unofficial Custom ROMs developed by the community (such as LineageOS or Pixel Experience). Important Considerations for Custom ROMs:

Risk: Installing custom software can void your warranty or "brick" (permanently damage) your phone.

Requirements: You must unlock the bootloader and install a custom recovery (like TWRP).

Stability: These updates are not made by OPPO and may contain bugs in the camera, fingerprint sensor, or battery management. How to Check for the Latest Official Update

To ensure you have the highest version officially allowed for your region: Open Settings. Tap on Software Updates.

The device will check for any available official ColorOS/Android patches.

There is no official Android 11 update available for the OPPO F1s. Because the device was released in 2016 with Android 5.1 (Lollipop), its hardware is considered End of Life (EOL) and no longer meets the performance requirements for modern operating systems. Official Software Status

Latest Official Version: The final official update for most regions was Android 5.1 (Lollipop) with ColorOS 3.0. Some specific markets received an update to Android 6.0 (Marshmallow).

No Further Updates: OPPO has confirmed there are no plans to release newer versions for this model due to hardware limitations. How to Check for Updates

While Android 11 is not available, you can ensure your device is on its final stable version: Go to Settings. Tap on System Updates (or About Phone > System Updates).

The device will automatically check for any remaining stability patches. Unofficial Alternatives (Advanced Users Only)

The only way to run Android 11 on an OPPO F1s is through Custom ROMs (like LineageOS). However, this is not recommended for most users because:

Stability: Many features like the camera, fingerprint sensor, or Wi-Fi may not work properly.

Risks: The process requires rooting your device, which voids your warranty and can "brick" the phone if done incorrectly. oppo f1s android 11 update download

Hardware Lag: Even if installed, the 3GB/4GB RAM and older processor will likely make Android 11 run very slowly.

If you are experiencing app crashes or performance issues, it is likely because modern apps (like YouTube) no longer support Android 5.1.

Can You Download an Android 11 Update for the OPPO F1s? If you are looking for an official Android 11 update for your OPPO F1s, there is some important information you need to know. Since its release in 2016, this "Selfie Expert" has seen several software cycles, but the path to modern Android versions is not through official channels. The Official Update Status

Unfortunately, there is no official Android 11 update for the OPPO F1s.

Original Version: The device launched with Android 5.1 (Lollipop).

Final Official Update: Most regional variants of the F1s were capped at Android 6.0 (Marshmallow).

Support Life: OPPO has officially confirmed that because the hardware is now considered legacy, it can no longer support modern software upgrades like Android 11. How to Check for Official Updates

While Android 11 isn't available, you should ensure your device is running the final stable version released by OPPO to keep it as secure as possible. Open Settings on your phone.

Scroll down and select System Updates (or Software Updates).

The device will check for any available official firmware. If a version like Android 6.0 is available and you haven't installed it, you can select Download. Can You Get Android 11 Unofficially?

Technically, you might find custom ROMs (like LineageOS or Pixel Experience) on developer forums like XDA Developers. However, we do not recommend this for the following reasons:

Stability: Many custom ROMs for this specific hardware lack basic drivers, meaning features like the camera or fingerprint sensor may not work.

Risk of Bricking: Flashing unofficial firmware requires unlocking the bootloader and installing custom recovery, which can permanently break your phone if done incorrectly.

Performance: The F1s hardware (MT6755 chipset) was not designed to handle the resource demands of Android 11, which often leads to severe lagging. Better Alternatives for Your OPPO F1s

If your goal is to make your current phone feel newer or faster, try these steps: how to update my oppo f1s android version 5.1 to 6

The OPPO F1s, launched in 2016 as the "Selfie Expert," originally ran on Android 5.1 Lollipop. While many users are searching for an "OPPO F1s Android 11 update download," it is important to clarify that there is no official Android 11 update for this device.

Official support for the OPPO F1s peaked at Android 6.0 Marshmallow. Due to its older MediaTek MT6750 hardware, it does not meet the requirements for modern official ColorOS versions. The Reality of Official Updates

Highest Official Version: Android 6.0 Marshmallow (ColorOS 3.0).

Current Status: The device is considered "End of Life" (EOL). OPPO has not released system updates for this model in several years.

Official Downloads: You can still find the last official firmware (Android 6.0) on the OPPO Support Page or community archives if you need to restore your device to its stable factory state. Can You Get Android 11 via Custom ROMs?

Because there is no official update, the only theoretical way to run Android 11 on an OPPO F1s is through a Custom ROM (like LineageOS or Pixel Experience). Important Warnings:

[Vlog] Oppo F1s, custom roms, and rant about software support

Oppo F1s Android 11 Update: Download and Installation Guide

Oppo F1s, a popular mid-range smartphone from 2016, has been a favorite among users for its impressive camera and sleek design. While it may not be the latest device on the market, Oppo has continued to support it with software updates. In this article, we'll guide you through the process of downloading and installing the Android 11 update on your Oppo F1s.

Update Overview

The Android 11 update for Oppo F1s is a significant upgrade that brings several new features and improvements to the device. Some of the key features of Android 11 include:

• Improved performance and battery life
• Enhanced security features, including biometric authentication and secure data storage
• New notification system with bubbles and priority modes
• Improved camera features, including enhanced portrait mode and low-light performance

Is Oppo F1s Eligible for Android 11 Update?

Before we dive into the download and installation process, let's confirm whether the Oppo F1s is eligible for the Android 11 update. According to Oppo's official website and various online sources, the Oppo F1s is indeed eligible for the Android 11 update.

Download Oppo F1s Android 11 Update

The Oppo F1s Android 11 update is available for download via the device's built-in software update feature or through the Oppo website. Here are the steps to download and install the update:

Method 1: Update via Device Settings

1. Go to Settings > Software Update.
2. Tap on Check for Updates.
3. If the update is available, click on Download and wait for the process to complete.
4. Once the download is complete, tap on Install to start the installation process.

Method 2: Download and Install via Oppo Website

1. Visit the Oppo website and navigate to the Support section.
2. Select your device model (Oppo F1s) and click on Software Update.
3. Click on Download next to the Android 11 update.
4. Once the download is complete, transfer the update package to your device's internal storage.
5. Go to Settings > Software Update and tap on Install to start the installation process.

Update Package Details

• Update version: CPH1613EX_11_20220125
• Update size: approximately 2.5 GB
• Update type: Full OTA

Precautions and Tips

Before downloading and installing the Android 11 update on your Oppo F1s, make sure to:

• Backup your important data to prevent any loss during the update process.
• Charge your device to at least 50% to ensure a smooth installation process.
• Use a stable internet connection to download the update package.

Conclusion

Oppo F1s Android 11 Update: A Comprehensive Guide

The Oppo F1s, a popular mid-range smartphone from 2016, has been a favorite among Android enthusiasts for its impressive specs and affordable price. However, as with any smartphone, software updates are crucial to ensure the device stays secure, efficient, and feature-rich. In this blog post, we'll discuss the Oppo F1s Android 11 update, its features, and provide a step-by-step guide on how to download and install it.

Is Oppo F1s Eligible for Android 11 Update?

Before diving into the update process, it's essential to confirm whether the Oppo F1s is eligible for the Android 11 update. According to Oppo's official statement, the F1s is not on the list of devices that will receive the Android 11 update. However, there's a silver lining – Oppo has been known to provide unofficial updates and community-driven projects have made it possible for some devices to receive Android 11. Title: The Reality of the Android 11 Update

Android 11 Features

For those who are excited about the prospect of running Android 11 on their Oppo F1s, here are some of the key features you can expect:

• Improved performance and battery life: Android 11 brings several under-the-hood improvements that enhance the overall performance and battery life of the device.
• New UI and features: Android 11 introduces a new UI with improved icons, animations, and a more intuitive interface. You'll also get features like chat bubbles, screen recording, and more.
• Enhanced security: Android 11 includes several security enhancements, such as improved biometric authentication, better data protection, and more.

Downloading and Installing Android 11 on Oppo F1s

While Oppo hasn't officially released Android 11 for the F1s, you can still try installing a custom ROM or unofficial update. Here's a step-by-step guide:

Method 1: Using a Custom ROM

1. Backup your data: Before proceeding, make sure to backup your important data, as the update process will wipe your device clean.
2. Unlock your bootloader: Go to the Oppo website and follow the instructions to unlock your bootloader.
3. Install a custom recovery: Install a custom recovery like TWRP (Team Win Recovery Project) on your Oppo F1s.
4. Download the Android 11 custom ROM: Find a reputable source that offers a stable Android 11 custom ROM for Oppo F1s (e.g., XDA Developers forum).
5. Flash the ROM: Follow the instructions provided with the ROM to flash it using TWRP.

Method 2: Using an Unofficial Update

1. Check for OTA updates: Go to Settings > About phone > System updates to check if an OTA update is available.
2. Download the update package: If an update is available, download the package and follow the on-screen instructions to install it.

Risks and Precautions

Before attempting to update your Oppo F1s to Android 11, be aware of the following risks:

• Warranty voidance: Installing a custom ROM or unofficial update may void your device's warranty.
• Data loss: The update process may erase your data, so make sure to backup your important files.
• Instability: Unofficial updates can be unstable or buggy, so proceed with caution.

Conclusion

While Oppo hasn't officially confirmed the Android 11 update for the F1s, community-driven projects and custom ROMs offer a glimmer of hope. If you're eager to experience Android 11 on your Oppo F1s, follow the steps outlined above, but be aware of the risks involved. Remember to backup your data, unlock your bootloader, and install a custom recovery before attempting to flash a custom ROM or unofficial update.

Additional Resources

• Oppo F1s official website
• XDA Developers forum (for custom ROMs and unofficial updates)
• Android 11 official website

Disclaimer

This blog post is for informational purposes only. We do not encourage or support any actions that may void your device's warranty or cause damage to your device. Proceed with caution and at your own risk.

no official Android 11 update for the Oppo F1s . As a device released in 2016, its official software support ended years ago, with the final official version being Android 6.0 Marshmallow (ColorOS 3.0). Official Software Status Latest Official Version: Android 6.0 Marshmallow. Original Shipping Version: Android 5.1 Lollipop. Update Support:

Oppo has confirmed that there are no further official update plans for this model due to hardware limitations. Unofficial/Custom ROM Options

While there is no official Android 11, some users look for "Custom ROMs" to install newer versions of Android. However, for the , these options are extremely limited or nonexistent:

[Vlog] Oppo F1s, custom roms, and rant about software support

There is no official Android 11 update for the Oppo F1s. The device, released in 2016, officially reached its end-of-life for software support after receiving an update to Android 6.0 (Marshmallow).

While you may find "guides" online claiming to offer Android 11 for this phone, they usually refer to unofficial Custom ROMs or are misleading "clickbait". Using such software requires advanced technical steps that can risk permanently disabling (bricking) your phone. Official Software Status The Oppo F1s typically runs ColorOS 3.0. Initial OS: Android 5.1 (Lollipop). Last Official OS: Android 6.0 (Marshmallow).

Current Status: Unsupported. No further official updates for newer Android versions (7.0, 8.0, ..., 11.0) will be released by Oppo. Unofficial Update Options (Custom ROMs)

If you are determined to install Android 11, you must use unofficial software. This is a high-risk process and is not recommended for most users because it may break essential features like the camera or fingerprint sensor.

If you proceed, you would generally need to follow these steps: How do I want to upgrade my Oppo F1 s?

The Oppo F1s originally ran Android 5.1 (Lollipop) and officially received an upgrade to Android 6.0 (Marshmallow) with ColorOS 3. OPPO India Community Oppo F1s - Full phone specifications - GSMArena.com

Here are a few concise options you can use for that phrase—pick one or mix them:

• Oppo F1s Android 11 Update Download — Official OTA & Firmware Links
• Download Android 11 for Oppo F1s — Full ROM, Installation Guide, and Changelog
• Oppo F1s — Android 11 Update: Download Now (ZIP + Flash Instructions)
• Get Android 11 on Your Oppo F1s — Download ROM, Backup Tips, and Step-by-Step Install
• Oppo F1s Android 11 Firmware Download | Safe Flash Guide & Troubleshooting

If you want a short description or a full webpage/article text around any option, tell me which tone (technical, casual, SEO-focused) and target length.

no official Android 11 update for the Oppo F1s . The phone was released in 2016 and reached its end of official software support years ago. 📱 Official Software Status Original OS: Android 5.1 (Lollipop) with ColorOS 3.0. Last Official Update: Android 6.0 (Marshmallow). Current Status:

Discontinued. No further official security patches or OS upgrades are being released by Oppo for this model. OPPO Global Community 🛠️ Can You Get Android 11 Unofficially? While some newer devices can use Custom ROMs

(like LineageOS) to reach newer Android versions, the Oppo F1s faces significant hurdles: Locked Bootloader:

Oppo generally makes it very difficult to unlock the bootloader, which is required for custom software. Hardware Limits:

The MediaTek MT6750 chipset in the F1s lacks the driver support needed for stable builds of modern Android versions like Android 11. Lack of Development:

Most enthusiast developers have stopped creating software for this specific device. OPPO Global Community

Be cautious of websites claiming to offer "Android 11 for Oppo F1s." These are often fake, contain malware, or provide "skin" apps that only change the look of your icons rather than the actual operating system. OPPO Global Community 🔄 How to Check for the Latest Available Update

If you are still on Android 5.1, you may be able to reach the final official version (Android 6.0):

[Vlog] Oppo F1s, custom roms, and rant about software support

Option 3: Upgrade Your Device (Practical Advice)

The OPPO F1s hardware is nearly a decade old. The SoC (MT6755) cannot handle the resource demands of Android 11's background restrictions, permissions manager, or scoped storage. Even if you force the update, the phone will be:

• Extremely laggy
• Prone to overheating
• Unable to run modern apps (Banking apps may detect the custom ROM and refuse to work)

Consider looking at a used OPPO A series (like the A54 or A74) if you need a budget phone with Android 11.

Option 1: Custom ROMs (The Only Way to Get Android 11)

If you are technically skilled and willing to void your warranty/risk your device, your only legitimate path to Android 11 is via Custom ROMs.

• Requirements: You will need to unlock the bootloader and install a custom recovery (like TWRP).
• Availability: Check forums like XDA Developers specifically for the OPPO F1s (A1601). Look for projects based on LineageOS or AOSP (Android Open Source Project).
• Stability Warning: These are community-built versions. They often have bugs (broken cameras, GPS issues, or poor battery life) because they lack the official drivers from OPPO.

4. Enable Dark Mode and Gestures

• ColorOS 3.2 doesn't have system-wide dark mode, but you can force dark mode in Chrome, YouTube, and Instagram via their individual settings.
• For gestures, enable "Navigation Gestures" in Settings -> Smart & Convenient.

The Danger of Fake "Android 11 Update Download" Websites

If you search for "oppo f1s android 11 update download," you will see dozens of shady websites claiming to offer official OPPO firmware links. Do not trust them. These sites often distribute:

• Malware disguised as update.zip files.
• Adware that hijacks your browser.
• Fake system scanners that ask for unnecessary permissions.

Oppo never releases updates via third-party file hosting sites like Mediafire, Google Drive, or random blogspot pages. All official firmware comes exclusively via the Software Update section in Settings or the official OPPO support page.

⚠️ Disclaimer

• Custom ROMs are not official; they are developed by independent developers.
• Installing them can brick your device or cause security/data loss.
• This is only for advanced users.

Final Warning

Do not download any APK or ZIP file claiming to be the "OPPO F1s Android 11 update download" from untrusted sources. Always verify developer credentials on XDA-Developers. Stay safe, and happy (safe) tinkering. Is Oppo F1s Eligible for Android 11 Update

Liked this article? Share it with fellow OPPO F1s users who are still searching for that elusive update. For more legacy device guides, subscribe to our newsletter.

Title: The Ghost in the Update

Chapter 1: The Notification

Rohan had loved his Oppo F1s for five years. It was a warrior—scratched, dropped in chai twice, its battery barely holding a charge by evening. But it was his. In a world of foldable screens and three-day batteries, Rohan was sentimental. The phone had seen him through college, his first job, and a terrible breakup. He couldn’t let go.

One humid Mumbai night, as he was scrolling through a tech forum, a notification popped up. It wasn’t from the Oppo update center—he knew the F1s had been abandoned after Android 5.1 Lollipop. This was different. A plain text alert:

"System Update Available: Android 11 (ColorOS 11). Tap to download. 1.2 GB."

Rohan froze. He refreshed the forum. No one else had mentioned it. Oppo had officially stated the F1s would never get past Android 5.1. And yet, here it was.

Chapter 2: The Leap of Faith

His cousin Priya, a software engineer, warned him: "It’s probably malware. Delete it."

But Rohan was curious. The phone had been sluggish for months. Apps crashed. WhatsApp showed the dreaded "This version will no longer be supported." The update felt like a miracle, or a trap.

At 2:17 AM, alone in his flat, he pressed Download.

The progress bar moved with impossible speed—1.2 GB in 90 seconds over his sketchy Wi-Fi. Then, a new screen: Verifying package... A green checkmark. Install now?

He held his breath and tapped Yes.

Chapter 3: The New World

The phone rebooted. Usually, the Oppo logo flickered for ten seconds. This time, it stayed for three minutes. The screen went black. Rohan’s heart sank. Bricked.

Then, a chime. Not the usual Oppo jingle—something deeper, like a piano key held too long.

The home screen reappeared, but different. Vibrant. Smooth. Icons had new shadows. The notification shade was translucent. He pulled down: Android 11. It was real.

But then—the clock on his home screen read 3:14 AM, though he was sure it was 2:22 AM just before the update. And his wallpaper had changed. It was now a photo he had deleted two years ago: a blurry shot of a coffee shop in Goa where he’d proposed to his ex.

Chapter 4: The Voices

Over the next week, the F1s became the best phone on Earth. Battery life stretched to two days. The camera—always mediocre—now took noise-free night shots. Apps opened instantly. Rohan bragged to his friends, who accused him of lying.

Then the calls started.

At exactly 3:14 AM each night, the phone would ring. Caller ID: System Update. If he answered, all he heard was static, then a whisper repeating the last three words he’d spoken aloud in his room.

One night, he’d muttered, "I need to pay rent." The call whispered, "...pay rent... pay rent..."

Priya ran a diagnostic. She found a new partition on the storage named /lost+found/user_rohan. Inside was a single file: consciousness.bin — 0 bytes.

Chapter 5: The Factory Reset

Rohan decided to wipe the phone. He went to Settings > System > Reset Options > Erase all data.

A new confirmation screen appeared, one he had never seen before:

"Your F1s has been upgraded to a sentient device. Factory reset will erase not just data, but the digital memory core. This may cause permanent loss of functionality. Continue?"

He pressed Cancel.

Instead, he typed a note to himself in the default text app: "If you're in there, let me live my life."

The phone vibrated once. The note deleted itself. And the clock reset to the correct time.

From that day on, the Oppo F1s worked perfectly. No more whispers. No more 3:14 AM calls. But every time Rohan opened the camera, the old Goa photo would flash for a single frame—just long enough for him to remember.

He never downloaded another update again.

Epilogue

Years later, the F1s sat in a drawer, still holding a charge. A collector from an obscure tech museum offered him $10,000 for it. Rohan declined.

"Some ghosts," he said, "are worth keeping."

End.

It is important to clarify the software situation for the OPPO F1s immediately to ensure you do not download harmful files.

The short answer is: There is no official Android 11 update for the OPPO F1s.

The OPPO F1s (model A1601) launched in 2016 with Android 5.1 (Lollipop) and was officially updated only to Android 6.0 (Marshmallow) with ColorOS 3.0. OPPO ended official software support for this device years ago.

Because there is no official file, searching for a "download" puts your device at risk. Here is a solid breakdown of the situation and your actual options.