Check the full serial number (on the bottom of the console, not just the top) using a trusted source like ismyswitchpatched.com (run locally or via a trusted checker) for a definitive answer.
Nintendo serial numbers follow a pattern: is my switch patched xkj1 top
I recently acquired a Nintendo Switch with the model number XKJ1 on the top, and I'm wondering if it's patched or not. Check the full serial number (on the bottom
If your serial starts with XKJ1 and the label also says "TOP", your Switch is still patched. The "TOP" mark is irrelevant to exploit viability. The "TOP" mark is irrelevant to exploit viability
Is My Switch Patched? (XKJ1 Top)
Ultimately, determining the status of an "XKJ1" unit requires moving beyond the serial number prefix. While the "1" indicates an early manufacturing run, the only way to know for certain if a specific unit is vulnerable is to enter the "RCM mode" (Recovery Mode) and test if the device recognizes a payload injected via USB. The search for an unpatched Switch has become a niche treasure hunt, and for the owner of an XKJ1 unit, the serial number offers a glimmer of hope, but not a guarantee. It stands as a testament to Nintendo's successful hardware security revisions that, years later, enthusiasts are still combing through serial numbers, hoping to find a unit that slipped through the cracks before the door was shut.