For the most up-to-date and safest methods, the community-standard resource remains the 3DS Hacks Guide .
Are you trying to for a specific custom firmware version, or are you having trouble running a script from a file you already downloaded? S_yExclusivezip
If the pack included a script, navigate to [0:] SDCARD -> gm9 -> scripts and run the setup script. For the most up-to-date and safest methods, the
Always back up your sysNAND via GodMode9 before running automated scripts from a zip file. S_yExclusivezip