Is My Switch Patched Xkj1 Top May 2026

All XKJ1 units are “patched” (unpatched vulnerability is extremely rare / non-existent in retail models).

The XKJ1 serial prefix corresponds to Nintendo Switch consoles with the “Mariko” Tegra X1+ chip (also known as the “HAC-001(-01)” model with improved battery life). The Fusée Gelée exploit was hardware-patched starting from this chip revision.

| Top number example (full serial) | Likely status | Reasoning | |----------------------------------|---------------|------------| | XKJ100000000 – XKJ1002xxxxx | Patched | Earliest Mariko units; bootrom fixed. | | XKJ1003xxxxx – XKJ1009xxxxx | Patched | Still Mariko; no unpatched models known. | | XKJ101xxxxxx and above | Patched | Confirmed patched. | is my switch patched xkj1 top

In mid-2018, Nintendo released a hardware revision to close a critical vulnerability in the original Switch’s bootROM. This vulnerability, discovered by the hacker Katherine Temkin and named Fusée Gelée (CVE-2018-6242), allowed any Switch manufactured before July 2018 to enter Recovery Mode (RCM) and run unsigned code via a simple USB payload.

Nintendo has released multiple hardware iterations since: the "Mariko" motherboard (with longer battery life), the Switch Lite, and the OLED model. All of these are patched. The XKJ1 prefix appears on patched, original-style V2 consoles (not the Lite, not the OLED, but the red-box battery life model). All XKJ1 units are “patched” (unpatched vulnerability is

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

| Serial Prefix | Status | |---------------|--------| | XKJ1... | Likely patched | the Switch Lite

Conclusion:
A Switch with serial XKJ1 is almost certainly patched against the Fusée Gelée hardware exploit (RCM hack). Unpatched units are generally found in serials up to XKJ7000xxxxxx (early 2018). XKJ1xxxxxxx indicates a significantly later build.