nope, no cfw, and yes i know that tunnel with pokemon and i did get the hm first.... Like walking in Rock Tunnel without HM05 Flash in Pokemon Red/Blue.
First of all, does the n2DSXL has custom firmware? Being able to access GodMode9 means it's already hacked.
If you insist on trying to hack it anyway, system update it to the latest 11.14U firmware, and follow the 3ds.hack.guide's seedminer method.
Good luck because you'll definitely going to need it.
You know you're on the right forum when people make these kinda references... Like walking in Rock Tunnel without HM05 Flash in Pokemon Red/Blue.