Okay, when it comes to cfw I suffer Some weird issue where the it also freezes after installing devmenu.
My workrooms for that is to.. reinject rednand!
Apparently after installing devmenu, my rednand file size changes (emunand tool prompts me that nand not recognised Cause invalid size or something).
The reinjecting of a rednand backed up before devmenu seemed to solve the problem, if I ever managed to boot into cfw hahah.
I only use cfw to back up retail saves that are smaller than 512kb