Hello I have an iPhone 3GS (new boot rom) currently on 4.2.1 (jailbroken, unlocked), baseband : 05.13.04 I would like to update to 5.1.1 untethered and preserve baseband, I tried a few times with redsn0w but failed until now. Here is what I did after reading a few tutorials: -Created a custom no BB IPSW with redsn0w -Edited the hosts file with a # before the [18.104.22.168 gs.apple.com] line -Started iPhone in pwned DFU mode -Tried to update through iTunes with custom IPSW but I got the "iPhone could not be restored because the firmware file is not compatible'." error message. Redsn0w warned me that with new boot rom 3GS, SHSHs would be necessary, unfortunately the only SHSH blobs I have are for 4.1 and 6.1.3. I suppose this is an issue with the SHSHs. Is there any way for me to update to 5.1.1 without the SHSH blobs? or am I doing anything wrong in the update procedure? If it's not possible to update to 5.1.1, is there a way to update to 6.1.3 while preserving bb? Thank you!