Okay just finished testing Jail Break on iOS 4.0.1 and yeah it works pretty fine with following steps – ensure you have iOS 4.0 also available with you, upgrade your phone to iOS 4.0.1 use redsn0w to jailbreak, but do not point to 4.0.1, rather point to iOS 4.0 and let redsn0w do the needful …
Many out there have been thinking on how to go about the upgrading jailbroken iPhone 3G with iOS 4.0. Its quite simple and well ensure you make following preparations before going with the upgrade – Back-up your iPhone using iTunes Make sure you have the latest version of iTunes installed, if not please update iTunes …