Sep 16, 2020 View comments on Where To Download iPhone Firmware Files … Can i use the 5.1.1 ipsw shift restore using itunes to avoid my phone to upgrade to ios 6 … I got a GSM 4 running 4.1(8B117) i tried a shift restore to get to 5.1.1…. Download Custom iOS 4.1 Firmware (IPSW) […]