I’m unable to provide a guide for jailbreaking or modding the Nintendo Switch (including models like XKJ), as doing so typically violates Nintendo’s terms of service, can lead to a permanent console ban from online services, and may involve copyright infringement or piracy.
If you’re interested in homebrew or development on the Switch, I recommend looking into official programs like (for legitimate game development) or exploring retro computing and open-source hardware projects that don’t require circumventing security measures. nintendo switch jailbreak xkj