I need the device model and Android version to give exact steps; I'll assume a common Android phone with an unlocked bootloader path via fastboot. Steps below use Termux on-device and require a PC only if your device blocks fastboot over USB from the phone.

Warning: unlocking the bootloader erases all data and may void warranty. Proceed only if you accept that.

Prerequisites

  • Backup all data.
  • Enable Developer Options → USB debugging and OEM unlocking (if present).
  • Install Termux (updated) and grant storage permission if needed.
  • Install required packages in Termux: 
    pkg update -y
pkg install openjdk-17 git wget unzip -y
pkg install android-tools -y
    (android-tools provides adb/fastboot.)

Method A — Unlock via fastboot from Termux (device supports fastboot mode and USB OTG with host capability)

  1. Connect phone to itself via OTG cable and a USB adapter only if you have a second host device; if using the same phone as host is not possible, use a PC (see Method B).
  2. Reboot into bootloader: 
    adb reboot bootloader
    or power-button combo.
  3. Verify device in fastboot: 
    fastboot devices
  4. If device lists, unlock:
    • For most devices: 
      fastboot oem unlock
    • For newer devices (A/B and fastboot flashing): 
      fastboot flashing unlock
    • Some vendors require a specific unlock key or token (Huawei, Motorola, etc.). Follow vendor instructions.
  5. Confirm on the phone (use volume keys + power) to accept bootloader unlock. Device will factory-reset.

Method B — Using PC (recommended if Termux cannot access USB)

  1. On Termux install steps above then transfer/install platform-tools on PC or just use Termux to prepare, but connect phone to a PC with adb & fastboot installed.
  2. From PC: 
    adb reboot bootloader
fastboot devices
fastboot flashing unlock
    Confirm on device.

Vendor-specific notes (high-level)

  • Samsung (modern): uses Odin and download mode; bootloader unlock not available in fastboot on many models — follow Samsung unlock procedure.
  • Xiaomi/Poco/Redmi: May require obtaining unlock permission via Mi Unlock tool and wait period.
  • Motorola/Huawei/Some others: May need an unlock code from vendor website.

If you tell me your device model and Android version I will give a precise, step-by-step command list and vendor-specific caveats.

Related search suggestions are being prepared.

Unlocking a bootloader directly from Termux (using one Android phone to unlock another) is a popular method for enthusiasts who don't have a PC nearby. ⚡ The Short Answer You cannot unlock the bootloader of the device you are currently using through its own Termux app. You must use a second Android device connected via a USB OTG cable. 🛠️ Prerequisites Target Phone: The one you want to unlock. Host Phone: The one running Termux. USB OTG Adapter: To connect the two phones. Developer Options: "OEM Unlocking" and "USB Debugging" enabled on the target. 🚀 Step-by-Step Process Install Tools Open Termux on the host phone and run: pkg update && pkg install android-tools Connect Devices

Plug the OTG cable into the host and the standard cable into the target. Check Connection adb devices Accept the prompt on the target phone screen. Reboot to Bootloader adb reboot bootloader The Unlock Command Once in fastboot mode, type: fastboot flashing unlock (Note: Use fastboot oem unlock for older devices.) Confirm on Target

Use the volume keys on the target phone to select "Yes" and the power button to confirm. ⚠️ Important Warnings Data Wipe: This will factory reset your device. Back up everything! This usually voids your manufacturer warranty. Your device becomes less secure against physical tampering. If you'd like, I can help you find: The specific button combinations for your phone model. official unlock key websites for brands like Motorola or Xiaomi. A guide on how to root with Magisk once the bootloader is open. Let me know your phone model to get specific instructions!

Unlocking a bootloader using Termux allows you to perform advanced Android modifications like installing custom ROMs or rooting without needing a PC. This process typically involves using a secondary Android device (Host) to send commands to your primary device (Target) via a USB OTG connection. ⚠️ Warning

Unlocking the bootloader will factory reset your device and erase all user data. It may also void your warranty and disable security features like Samsung Knox. Requirements

Host Device: A secondary Android phone with Termux and Termux API installed from F-Droid. Target Device: The phone you want to unlock.

Hardware: A USB OTG adapter and a compatible USB data cable.

Settings: OEM Unlocking and USB Debugging must be enabled in the Target device's Developer Options. Step 1: Set Up Termux on Host Device

Open Termux on the host phone and run these commands to install the necessary tools: Update packages: pkg update && pkg upgrade Install API and Git: pkg install termux-api git

Install ADB/Fastboot: Use a tool like termux-adb to enable USB communication through the API: git clone https://github.com cd termux-adb && ./install.sh Step 2: Prepare Target Device

Go to Settings > About Phone and tap Build Number 7 times to enable Developer Options.

In Developer Options, toggle on OEM Unlocking and USB Debugging.

Connect the two phones using the OTG adapter (plugged into the Host) and USB cable. Step 3: Unlock via Fastboot

Unlocking an Android bootloader via Termux represents a modern shift in device modification, allowing users to perform deep-system tasks typically reserved for PCs using only another mobile device. By leveraging an OTG connection and specific terminal tools, you can bypass the need for a computer to gain full control over your device's software. The Philosophy of PC-Free Customization

Historically, the "tethered" nature of Android modding meant you needed a desktop environment to execute fastboot commands. Using Termux as a host transforms a secondary Android phone into a portable workstation. This method is particularly popular for Xiaomi, Redmi, and Poco devices, which often require specific tokens and waiting periods that can now be managed through mobile-based scripts. Core Requirements for the Process

Before attempting to unlock, you must gather these essential components:

Unlocking your bootloader using (often referred to as a "hot" or PC-less method) allows you to bypass the need for a computer by using a second Android device. This process requires a physical connection between two phones using an OTG adapter Essential Requirements Target Device : The phone you want to unlock. Host Device : A second Android phone with installed to send commands. Connection : A USB data cable and an OTG (On-The-Go) adapter to link the two phones. : Unlocking the bootloader wipes all user data ; ensure you have a full backup before starting. Step 1: Prepare the Target Device

Before connecting, you must enable hidden settings on the phone you wish to unlock: About Phone Build Number seven times until "Developer options" is enabled. Navigate to Developer Options USB Debugging OEM Unlocking

: For Xiaomi/Poco devices, you must also add your account under Mi Unlock Status Android Open Source Project Step 2: Setup Termux on the Host Device

On the second phone, install the necessary tools to communicate with the target:

How to Unlock Bootloader Using Termux Hot (No PC Method) Unlocking an Android bootloader traditionally requires a PC and the Android SDK Platform Tools. However, a "hot" method using Termux allows you to perform this task using only a secondary Android device. This guide explains how to set up your mobile environment to unlock another device's bootloader without a computer. Requirements and Preparation

Before starting, ensure you have the following hardware and software ready:

Host Device: A secondary Android phone with the Termux app installed.

Target Device: The phone you want to unlock. It must have OEM Unlocking and USB Debugging enabled in the Developer Options.

OTG Connection: A USB OTG adapter and a data cable to connect the two phones.

Backup: Unlocking the bootloader wipes all user data from the target device. Step 1: Setting Up Termux on the Host Device

Open Termux on the host device and run these commands to install the necessary tools: Update Packages:pkg update && pkg upgrade Install wget and API tools:pkg install wget termux-api

Install ADB and Fastboot:You can use a script to install these tools without root. A popular option is the Termux-ADB script:wget https://githubusercontent.combash install.sh Step 2: Connecting the Devices

Connect the host phone to the target phone using the OTG adapter (host side) and the data cable.

On the target phone, a prompt will appear asking to "Allow USB Debugging." Select Allow. In Termux, verify the connection:adb devices Step 3: Entering Fastboot Mode

Once the devices are communicating, reboot the target device into its bootloader: Run the command:adb reboot bootloader

Wait for the target device to show the Fastboot/Bootloader screen. Confirm the connection in fastboot mode:fastboot devices Step 4: Executing the Unlock Command

Depending on your device manufacturer, use one of the following commands: Standard Android/Google/Motorola:fastboot flashing unlock Older or Specific OEM Models:fastboot oem unlock

On the target device, a warning screen will appear. Use the Volume keys to select "Unlock the bootloader" and the Power button to confirm. Special Case: Xiaomi Devices

Xiaomi devices require a specific "hot" tool to retrieve an unlock token from their servers, as they don't use standard fastboot commands.

Account Binding: You must bind your Mi Account in Settings > Mi Unlock Status and often wait for a timer (7–30 days).

Termux MiUnlock: You can use specialized scripts like termux-miunlock to perform the final unlock without a PC once the waiting period is over. Troubleshooting Common Issues

Now in fastboot mode - unlock

fastboot devices fastboot oem unlock # For some devices

On Your Phone (Termux)

# Update packages
pkg update && pkg upgrade -y

Using Termux for Bootloader Unlocking


If you're looking to use Termux for unlocking a bootloader, you would typically:


    

  1. 

    Install Termux: Download and install Termux from the Google Play Store or F-Droid.
    

    2. 

  2. 

    Grant Storage Permission: Run termux-setup-storage and grant the permission.
    

    3. 

  3. 

    Install adb and fastboot in Termux: You might need to compile or install these tools within Termux, but often, it's easier to use a computer for this step.
    

    4. 

  4. 

    Reboot to Fastboot: Use adb reboot bootloader in a computer's command prompt or directly use Termux if you have adb working.
    

    5. 

  5. 

    Unlock: The actual unlocking command (fastboot oem unlock) is typically done on a computer. For Termux, getting fastboot to work properly can be challenging.
    

    6. 



3. Requirements


    

  • Android 10+ (dynamic partitions friendly)
    • 

  • Unlocked OEM toggle already enabled in Developer Options
    • 

  • Termux with termux-api, tsu, and fastboot binary installed
    • 

  • Hot Mode may require disabling vbmeta verification temporarily
    • 





Troubleshooting


| Issue | Solution |
|-------|----------|
| remote: oem unlock is not allowed | Enable OEM Unlocking in Developer Options |
| waiting for any device in fastboot | Install proper USB drivers on PC |
| Termux ADB won't connect | Disable WiFi isolation on router |
| command not allowed | Device may have locked bootloader (no bypass) |