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 ...

What's New in iOS 9.3.5: iOS 9.3.5 provides an important security update for your iPhone or iPad and is recommended for all users.

To update your iPhone you will need to download the latest firmware file (IPSW). iOS 9.3.5 is an important security update that fixes a spyware flaw.