If you have an iPhone 3G and you have this feeling that upgrading to iOS 4 has slowed down your device and that you want to go back to iPhone 3.1.3 / 3.1.2. Or if you are one of those iPhone 3GS (new bootrom) or iPod touch 3G / 2G (MC model) user who has upgraded to iOS 4 only to find out that you cant jailbreak it can follow the instructions posted below to downgrade iOS 4.0 to iOS (formerly iPhone 3.1.3 or 3.1.2).
An independent French developer has come up with another tool to fix all iTunes 9.1 problems on blackra1n’d iPhones running iPhone 3.1.2 firmware. This tool, like BlackBreeze promises to fix all issues that you may be having with iTunes 9.1 and your iPhone, running on jailbroken iPhone 3.1.2.
