• Step-by-Step Guide to Jailbreak iPhone 3G running Firmware 2.2.1 using QuickPwn 2.2.5 (Mac) - iPhone Hacks
  The Dev Team had warned iPhone 3G users against updating to firmware 2.2.1 as it also included a baseband update which breaks the "injection hole" that they had used in their application yellowsn0w to modify the firmware which had helped to successfully unlock iPhone 3G. So if you want to...
  in Public bookmarks with 2.2.1 dev firmware iphone team updating users warned

2.2.1 from all users