Editing NCCH header Open the NCCH header (might be ncchheader.bin), or CFA in your hex editor. Find the unique ID in two locations: 0x109 0x119 Edit the two locations with your new unique ID.
Each unique ID is three bytes long and stored in little-endian, so the bytes are in reverse order. For example: EDF is 000EDF normally, 00 0E DF when separated by bytes, and DF 0E 00 in little-endian.