Perhaps the loadable modules in the GT5 content need to be re-signed for 3.41 as well?
I doubt there is anything specific in the firmware that demands updated binaries, beyond the keys, and surely any loadable modules would also be signed, right? Since it's 3.50 libs, that means 3.5 keys. Resign them with 3.41 and there should be no problems.
Working hard on UberCFW, incorporating NTFS, sub-free NetFlix and Blockbuster, PSN cheat system with built-in swearbot and MAC-spoofing, Adding MKV, RAM and BIK movie support, and Xbox360 emu*.
*not really. Get a life, newbs...
My YouTube channel: http://www.youtube.com/user/BenJeremy