Take a clear photo of your Switch’s back label (blurring any personal info aside from the serial) and post on r/SwitchHacks or r/SwitchPirates. The community will give the same answer: XKJ1 = patched. TOP = irrelevant.
: Because the hardware exploit (Fusee Gelee) is patched on these units, you
: You can install a physical hardware chip (such as the Picofly or HWFLY). is my switch patched xkj1 top
If your Nintendo Switch serial number starts with V2 (second generation) console Yes, your Switch is patched. Here is the detailed guide based on your inquiry: 1. What does XKJ mean? Nintendo Switch V2
The Nintendo Switch has been a phenomenal success since its release in 2017, with millions of units sold worldwide. However, as with any popular gaming console, the Switch has also become a target for hackers and modders looking to exploit its vulnerabilities. One of the most common concerns among Switch owners is whether their console is patched or not, particularly when it comes to the XKC1 and XKJ1 models. Take a clear photo of your Switch’s back
The prefix was introduced with the Nintendo Switch "V2" refresh in 2019.
The "XKJ" prefix identifies the console as a model, which features improved battery life but includes a hardware-level fix for the RCM (Recovery Mode) exploit found in original V1 units. This means it cannot be soft-modded using just an RCM jig and a payload injector. 🎮 Modding Status for XKJ1 Consoles : Because the hardware exploit (Fusee Gelee) is
It likely refers to the top assembly line in a manufacturing plant (e.g., Foxconn’s “TOP” facility vs. “BOT” for bottom assembly). Some Switches say "HAC-001 TOP", meaning the tablet’s top housing was assembled in a specific line. This text appears near the model number, not within the serial string.
When the community says a Switch is "patched," it specifically refers to a hardware-level vulnerability in the console's boot process. All unpatched Switch consoles are V1 models (the original version released in 2017) that contain a specific hardware flaw in the Nvidia Tegra X1 chip.
In mid-2018, Nintendo began releasing consoles with a hardware revision that patched this vulnerability. Any console released after this point is either "patched" or a completely different revision. Identifying which you have without opening the box is done entirely through the serial number. Because the serial number is printed on a white sticker at the bottom of every Switch and on a visible cutout of its retail box, it is the single most reliable method for determining hackability before purchase.