hey everyone. i recently bought a ps3 with 3.61 FW. i wanted to hack it so i can play ps3 backups and homebrew stuff i know that i can't hack it because i need 3.55 FW.and i heard about a downgrader made by Regero and i decided to try it. so i put the PS3UPDAT.PUP in PS3/UPDATE on my usb drive and plugged it on my ps3 with the hard drive. i went to setting>system update>and chose install. but when it gets to 69/70/71% it says data is corrupted. i tried mirrors but it's the same problem. please help me.