✗ This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.
| Release Date | February 10, 2022 |
|---|---|
| Upload Date | February 7, 2022 |
| Filename | iPhone_4.0_64bit_15.3.1_19D52_Restore.ipsw |
| Filesize | 5.0 GiB |
| SHA256sum | 2f83275abe237f6200e3b7b7b57eedcf497cffe205914d0735b60a7324eed04d |
| MD5sum | 940852c6df6eeebbc63ec10c2ac806d2 |
| SHA1sum | 91ef48064e59178f32478510afdd74edb37bd9b5 |
| Identifier | iPhone8,4 |
iOS 15.3.1 provides important security updates for your iPhone and fixes an issue that may cause Braille displays to stop responding.
For information on the security content of Apple software updates, please visit this website: