iOS 26.3.1 (23D8133) for iPhone 15

✓ This firmware is signed. This means that you can restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.

Release DateMarch 4, 2026
Upload DateMarch 1, 2026
FilenameiPhone15,4_26.3.1_23D8133_Restore.ipsw
Filesize9.4 GiB
SHA256sum864eab98814d3031fd7261383c2c6711b558a168984d26b370e1071cad163f1d
MD5suma7855ed5a885076e95c9f6f34cc5a213
SHA1sum20fded225621d86086c747676b0944b27963898b
IdentifieriPhone15,4

iOS 26.3.1 Release Notes

Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

This update provides bug fixes for your iPhone

For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/100100

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