The primary use case for this archive is the . Downgrading is pursued for several reasons:
| iOS Version | Last Signed Date | Compatible Devices | |-------------|------------------|---------------------| | iOS 9.0 | October 2015 | iPhone 4s, 5, 5c, 5s, 6, 6+ | | iOS 9.3.5 | October 2016 (32-bit) August 2017 (64-bit) | Same as above | | iOS 9.3.6 | November 2019 (only for cellular iPad 2/mini/4s GPS fix) | iPhone 4s, iPad 2, iPad mini, iPad 4 | Ios9 Signed 0429.zip
While it is hard to permanently "brick" an iPhone, using an incorrect or modified firmware bundle can put your device into a Permanent Recovery Loop. The primary use case for this archive is the
: Always back up your core device partitions (especially the EFS or local system directories) before attempting any file system modifications. Downloading
Downloading .zip files from random forums or file-sharing sites carries significant risks.
Downgrading an iOS device is not a trivial task and carries significant risks: