Is My Switch: Patched Xkj1 Top |top|

Is My Switch Patched? Decoding the "XKJ1 Top" Serial Number

If you’ve landed here, you’re likely holding a Nintendo Switch, staring at the back of the console, and squinting at a serial number that starts with XKJ1. You’ve probably heard whispers in online forums or YouTube videos about “unpatched” Switches being valuable for homebrew, custom firmware, or emulation. Your specific question is: “Is my Switch patched if the serial number is XKJ1 and I see the word ‘TOP’ on the label?”

Let’s cut through the confusion. This article will give you a definitive answer, explain what "patched" means, decode the XKJ1 prefix, and clarify the myth around the "TOP" marking.

How to Confirm (Without Searching Forums)

While the XKJ1 serial is a near-certain indicator, you can verify using the most reliable community tool:

  1. Write down your full serial number – It’s printed on the bottom edge of the Switch tablet (under the kickstand) or in the system settings (Settings > System > Serial Information).
  2. Visit ismyswitchpatched.com – Enter the serial number exactly.
  3. The result will say: “Your console is patched. It is not vulnerable to Fusée Gelée.”

For an XKJ1 serial, the website will show 100% patched. There are no false positives for this prefix.

Why “XKJ1” is important

If your serial begins with XKJ1, your Switch is not vulnerable to the coldboot exploit that works on unpatched units (serial prefix XAW1, XAW4, XAJ1, XAJ4, XAK1 up to a certain range). is my switch patched xkj1 top

Bottom line

Your XKJ1 top number indicates your Switch is patched. Do not buy an RCM jig expecting an unpatched exploit – it will not work. If you want homebrew or custom firmware, you will need a soldered modchip.

Yes, your Nintendo Switch with the serial prefix is As of April 2026, here is the breakdown of what that means for your console: Model Identification

prefix indicates that you have a "Mariko" unit, also known as the

model (often found in the all-red box). These units were manufactured with a updated Tegra X1+ chip that fixed the hardware vulnerability found in early 2017 models. Modding Status Is My Switch Patched

: Because the hardware exploit (Fusee Gelee) is patched on these units, you

use a "softmod" (software-only) or an RCM jig to install custom firmware like Atmosphere. Current Solutions : To mod an XKJ1 unit, you would need to install a physical modchip (such as an Instinct-NX or similar RP2040-based chips ), which requires precise soldering. How to Confirm for Certain

If you want to double-check your specific serial number, you can use community-maintained databases like the Switch Serial Checker NH Switch Guide Are you planning to install a modchip yourself, or are you looking for a pre-modded V1 unit instead?

Yes, your Nintendo Switch with a serial number starting with is definitely The "XK" prefix indicates that your console is a v2 "Mariko" model Write down your full serial number – It’s

, which features improved battery life but also contains a hardware-level fix for the RCM exploit used to soft-mod original units. Understanding "Patched" for No Soft-Mods

: You cannot use a "jig" and a computer to install custom firmware (CFW) like Atmosphere on this model. Hardware Locked

: The vulnerability found in early 2017/2018 models was physically removed from the Tegra X1+ chip used in your console. Modchip Requirement : To run custom software on an unit, you would need to install a physical (such as an RP2040-based chip ), which requires advanced micro-soldering skills. Comparison: Unpatched vs. Patched

Switch Patching Status Report

Query: XKJ1 (Top of serial number sticker)
Device: Nintendo Switch (Standard model, not OLED/Lite)
Target Check: Vulnerable to Fusée Gelée (RCM exploit)?

Option 2: Software-Only Exploits (Niche & Limited)

What “Patched” means for you

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