How to Downgrade iphone 3G Firmware 4.0.1 to 3.1.3 by z July 25, 2021, 12:46 pm 1.3k Views How to Downgrade iphone 3G Firmware 3.1.3 1ST LINK get the 3.1.3 version 2ND LINK http://blackra1n.com/ . Share this: See more Previous article iPadOS 15 Focus Modes! Setup, Walkthrough and more! Next article ABRSM Aural Trainer Lite