I have tried a number of dev_blind.pkgs, and none of them will install on my 4.21.1.REX CFW by Rebug.
I have even tried ones that were "supposedly" for 4.21 CFWs.
I have also tried resigning the 3.55 pkg to 4.21, but still won't install.
Can anyone help plz?
BTW: I have resigned all my homebrews and games from 3.55 to 4.21, and all of them are working