Free Iphone Unlock

iOS hacker and developer NotCom or also known as semaphore allows you to back up the SHSH blobs (ECID SHSH) so you can downgrade to an older version of the iOS and released a new tool named TinyCFW for iPhone 4 and iPad 2 users.
TinyCFW allows iPhone 4 and iPad 2 users who have taken backup of iOS 4.3.3. SHSH blobs to downgrade from iOS 5.0 to iOS 4.3.3.
NotCom explains that the TinyCFW is a simple tool that he put together for a friend. His friend has an iPad2 GSM and has his 4.3.3 SHSH but since Apple is no longer signing 4.3.3, it isn’t possible to downgrade to 4.3.3 without getting stuck in a 1015 recovery loop.
Here’s what TinyCFW can do:
It will modify an existing ipsw for an ipad2 gsm/cdma or iphone4 gsm/cdma
It WILL modify the ipsw TO UPDATE YOUR BASEBAND TO THE LATEST!
It will create an ipsw that you can use with TinyUmbrella AND iTunes to restore to a version of iOS that you have SHSHs for.
It is primarily for iPad2 with a baseband OR iPhone 4.
NotCom also made it clear that the TinyCFW is not a jailbreak, an unlock, a tool to protect your baseband, a restoring device. The TinyCFW is not also meant for iPhone 3GS and 3G, iPad and iPad 4S.
He has also provided the following instructions to use TinyCFW:
The usage is simple. Start the application. Once the window comes up, click the top button and choose an ipsw for which you have SHSHs for. The app will scan it and tell you the firmware and baseband versions in the ipsw you selected and the firmware and baseband versions that will be in the target ipsw when you click the second button. If you’re ready, click ‘Save Target IPSW’. This will take a minute or two and when it is finished, you will have a file named:
.bbupdate.ipsw.
You can use this ipsw with iTunes and TinyUmbrella to restore your iPad2 GSM/CDMA back to say 4.3.3 (if you have 4.3.3 SHSH).
NotCom has mentioned that he plans to include this functionality in TinyPwn and expects it to be far more robust then this initial version. So please proceed with caution.