Hello, I have a iPhone 3gs that was running on 5.0.1 unthethered jailbreak with unlocked 6.15.00 baseband. It recently started giving me problems to a point where it just became stuck on the Apple logo and wouldn't boot up. I tried everything to run a 5.0.1 custom firmware restore but nothing worked. I eventually updated the phone on iTunes to official 5.1 firmware. After doing that it still did not boot up and is sill stuck at the Apple logo. After this i did a custom firmware restore using redsnow with 5.1 but it is still stuck at the Apple logo. What can i do to fix this?