so i have searched and searched, and cant find a simple answer to my questions. maybe its because im tired, but all i can seem to find are complicated guides that tell you how to do this stuff. they might answer my question but i dont want to learn all about hacking a ps3 yet, i just want to know a couple things first. i have a phat 40gig model (with a 320gb hdd upgrade). it seems that all phat models can be downgraded from 4.80 to 3.55 just fine with soft mods and no hardware or physical mods required. what i cant seem to find out is 1. will the act of downgrading, or installing the cfw erase anything i have on there? ( save games, or psn games that ive bought) 2. if yes, can i do a backup and somehow restore any of it after the jailbreaking? 3. (i think its obvious why im wanting to jailbreak my ps3, but ill just keep that to myself) but i have a bunch of legit games, both disc and downloaded. can you still play those after you install cfw? like does the lack of getting online render your psn games unplayable because the system cant validate them or anything? or what happens if i have a disc game that needs a certain firmware version to run (i think there are some that do) and lastly 4. is compatibility pretty good? there are just a handfull of games i want to "procure" and run with multiman off a usb hard drive. my modded wii plays any game it seems with about 100% compatibility, my ps2 playing over network gives me id say about 90%, but those few that dont work i can just burn to a dvd and play them that way. but i wont have access to a blu ray burner, so i want to make sure that at least a good number of games will work over a usb hard drive, even if i have to install a couple trouble ones to the internal or something.