The keys you want are the private keys and are IMPOSSIBLE (It's not something that can be done, literally impossible) to obtain past 3.55
Your best hope is returning it to sony, recovering it with a nand/nor flasher, or hoping that sometime in the future someone at a Sony service center leaks the lv2diag.self for 3.56 and 3.60.
Last edited by cookie42; 05-03-2011 at 01:45 PM.
STOP! Before you ask questions... READ the first post! RTFFP = Read The F*cking First Post
Yes, A 3.55 "jb" (cfw) is available, no >3.55 "jb" or cfw yet.
Yes, A 3.55 downgrade is available. But not to lower than stock firmware! (What it came with)
No >3.55 downgrade is out there yet.