✗ This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.
| Release Date | January 26, 2022 |
|---|---|
| Upload Date | January 23, 2022 |
| Filename | iPhone_4.0_64bit_15.3_19D50_Restore.ipsw |
| Filesize | 5.0 GiB |
| SHA256sum | 57e5d20201b0d1b4238b620f69541bcec7733be07d5952681518a71f93203307 |
| MD5sum | e46ab1893056b01c050289a210408d00 |
| SHA1sum | cfa06a22d3748c8f4fd85903bcbc9d5a6f84e56e |
| Identifier | iPhone8,4 |
iOS 15.3 includes bug fixes and security updates for your iPhone and is recommended for all users.
For information on the security content of Apple software updates, please visit this website: