Hi i'm trying to JB a newer iphone 4 on 5.0.1 (9a405) with pwngtool and i tried to get my custom ispw off of felixbruns.com and i see a version for the iphone4 5.1 (9B176) but none matching my version. Do i want to upgrade the ios 5.1 (there's a option to do so in my settings) or do i want to not touch 5.1 thanks.. also will this make it (9B176)? or does it always stay (9a405)? THANKS!