Serial numbers are just an educated guess. The only way to know with 100% certainty if your XKJ1 Switch is patched is to test the .
While is definitive, you can verify your console’s details through these methods: Switch Hackable Serial List is my switch patched xkj1
If you want an unpatched Switch, search eBay or local marketplaces for serial numbers beginning with: Serial numbers are just an educated guess
The prefix indicates that your Nintendo Switch is a unit originally intended for the South Korean market . This is a crucial distinction
This is a crucial distinction. Serial number databases and "checker" tools are often flooded with data for North American (XAW) and European (XAW/XJW) units. There is significantly less public data regarding Korean units compared to Japanese or North American models.
Do not waste time buying RCM jigs, downloading payloads, or watching "unpatched XKJ1" YouTube videos (which are almost certainly scams or mislabeled). The XKJ1 prefix is a definitive marker of a post-patch Erista console.