Hi, I just got an iphone 3GS from AT&T and I saw in a few threads that this version of the bootloader in combination with the baseband, make the phone not unlock-able. Is there anyone who had success unlocking their iphone with the above specs? The phone came with 4.2.1 software, and I have saved my SHSH with Tinyumbrella. Have only tried limera1n so far, but no luck. Attaching info from f0recast. Thanks a lot!