✗ This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.
| Release Date | May 24, 2019 |
|---|---|
| Upload Date | May 22, 2019 |
| Filename | iPhone_4.0_64bit_12.3.1_16F203_Restore.ipsw |
| Filesize | 2.9 GiB |
| SHA256sum | 8d578d4c0c31dfb86271bc10841024629ed46becf6a53aaa6150f22840bb41a6 |
| MD5sum | 787d63093812d8abbcf0d247bb6d5385 |
| SHA1sum | a2421715aa1c95cd294e22d062bd0ce492bb4a26 |
| Identifier | iPhone6,1 |
iOS 12.3.1 includes bug fixes for your iPhone and iPad. This update:
Fixes an issue that could prevent making or receiving VoLTE calls
Fixes issues in Messages that could cause messages from unknown senders to appear in your conversation list even though Filter Unknown Senders is enabled
Fixes an issue that could prevent the Report Junk link from appearing in Messages threads from unknown senders
For information on the security content of this update, please visit this website: https://support.apple.com/kb/HT201222