Hi all, After having a bit of a nightmare with my first 3Gs I tought that I would try to pre-empt having another with my current one and be prepared for the upcoming release of redsnow 0.9.7 which will allow for an untethered JB on 4.2.1. Anyway, here is the story I am currently on IOS 4.1 which I successfully JB with redsnow 0.9.6. Only problem was that I was on the new boot ROM so had to update my Baseband to 6.15 (IPAD version) in order to use unlock on T-mobile. All good so far. My GPS does not work but I believe this is a problem with this BB version? Is that right? My question is will I be able to upgrade to IOS 4.2.1 with the anticipated release of redsnow or will I run into an itunes 1015 error since it wont be able to update the baseband? If so how do I get round this problem? Will I need to use a custom IPSW file? If so from where and will it have the updated BB? One last thing, will the new ios give me my GPS functionality back or is that down to the Baseband? Thanks all. Mac.