A number of iPhone users, both on Apple’s Discussion boards and in direct emails to iLounge, are reporting that the iPhone OS 3.0 upgrade process left them with bricked devices. According to the reports, users are running the normal upgrade routine, only to have their iPhones or iPod touches hang on the “Connect to iTunes” screen, with seemingly no way to fix the problem.
While some users have reported success with putting their devices into recovery mode and reconnecting, Windows users seem to be having a more difficult time with the process; some have been forced to revert back to 2.2.1, while others have been able to successfully connect and sync running 3.0, but only after installing the upgrade via a Mac. One PC user “suspect[s] that the latest v8.2 iTunes Windows installer does NOT properly install the specific recovery drivers needed for USB.
These are called iBoot and DFI USB drivers.”.