For those who are wondering if you can update your 3G or 3GS to 06.15 solely for the purposes of downgrading to , the answer is “yes” for 3G owners, and “maybe” for 3GS owners.The i Pad baseband is not compatible with 3GS units manufactured week 34 of 2011 or later.Manual method to put your i Phone into recovery includes the following steps: Download Rec Boot application for Windows Download Rec Boot application for Mac Update#1: Fix i Tunes 1015 Restore Error with Rec Boot During i OS 4 Downgrade Update#2: Windows 7 and Windows Vista (64-bit) users can follow this tutorial to install Lib USB without any issues. Update#7: Download Rec Boot 2.1 for Mac OS X 10.5.x and above.Update#3: Now you can also use Tiny Umbrella to kick your device out from recovery mode. Update#8: Download Rec Boot 2.2 for Mac OS X 10.5.x and above.The previous version covered only the most prevalent NOR chip.i Phone 3GS and i Phone 3G users can follow these simple steps to downgrade from baseband: Dev team have again reiterated that i Phone 3GS units manufactured in early 2011 or later have a NOR chip that’s incompatible with and so trying to install the i Pad baseband will brick the device.Also, if I don't unlock my phone, will I have to worry about messing something up with my baseband?
Baseband Downgrade: This version of Redsn0w covers 3 different types of NOR chips in the i Phone 3G and i Phone 3GS (the earlier version covered only the most prevalent NOR chip), so i Phone 3GS users who had problems downgrading the baseband using Redsn0w 0.9.14b1 should try this version of Redsn0w as it should fix their issue.Moreover this utility saves you from learning the 3-4 steps of putting your i Phone into recovery mode manually.Normally you need to put your i Phone into recovery mode when your want to do a firmware restore.Doesn't require Lib USB, all it needs is i Tunes and JRE installed on your computer. Update#5: With LAST DFU sofware, now you can put your i Phone into DFU mode with a single click. Update#9: Download Tiny Umbrella (Fix Recovery) to fix i OS 4.2.1 recovery mode loop issue.Update#10: Download Tiny Umbrella (Fix Recovery) to fix i OS 4.3 (NOT i OS 4.3.1) recovery mode loop issue.