I got a fresh cfw and I just tried to install a few homebrew apps like RetroArch and a gba emulator and none of them came with a rapdecryption error. it can't authenticate the license. are you using fixes or where did you get this package and rap?
Really appreciate you will tell you how it works in a couple days it's my buddies console I put cfw on and didn't know what to do afterwards just was installing random pkgs mostly and none worked and thanks again.