- iPhone 3GS running iOS 4 GM or iPhone OS 3.1.2 (mine was running a jailbroken copy of iOS 4 GM) with old bootrom. 05.13.04 baseband. First, download Pwangetool and the .ipsw firmware file to your ...

If you have an iPhone 3G, iPhone 3GS, iPhone ... you can find your iPhone's serial number using that device as well. 1. On the other device, start the Settings app. 2. Tap your name at the top ...