Just to recap for anybody coming across this thread:
3.56 AND ABOVE IS A DEAD END.
NO HOMEBREW FOR YOU!!!
I'm only leaving this thread here for any other morons that come by to ask something similar.
There are no hacks, no exploits, nothing is out to downgrade or otherwise allow the running of any homebrew or backups on firmware 3.56 and above. We cannot customize it, either, so STOP ASKING.
If a solution is ever found, it will be posted on the front page and it will be obvious. Until then, STFU and GBTW.
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