You say you did some research, but there are stickies and numerous threads stating that once you are on 3.56 YOU WILL NOT GET CUSTOM FIRMWARE.
Why is this so hard to understand?
Sony has new keys for 3.56, and they now properly randomize the session key when encrypting/signing content.
In other words, we have no way, short of Tom Cruise channeling Ethan Hunt to infiltrate Sony HQ and retrieve these keys from a secure computer, of getting the PRIVATE keys needed to create acceptable PUP files (or more specifically, creating properly signed selfs, sprxs, and spkgs).
Without these keys, 3.56 won't allow you to flash anything that isn't "official" firmware.
There are ways around this with a hardware flasher, but nobody is offering details on how that can be done, and it's MESSY.
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