Download iOS 26.3.1 (23D8133) for iPhone 15

You will have to note that you can only restore signed IPSW firmware files using iTunes or 3utools.

❌ This IPSW firmware is not being Signed by Apple

Firmware Identifier iPhone15,4
iOS Version 26.3.1
Release Date 2026-03-04
Update Date 2026-03-01
Sha1sum
20fded225621d86086c747676b0944b27963898b
Sha256sum
864eab98814d3031fd7261383c2c6711b558a168984d26b370e1071cad163f1d
md5sum
a7855ed5a885076e95c9f6f34cc5a213
Size 9.45 GB
FileName
iPhone15,4_26.3.1_23D8133_Restore.ipsw
Status

Download IPSW (9.45GB) Check device info
Release Notes

It should be noted that these are the official release notes for the from Apple

Design

Apple Intelligence

Camera

Photos

Phone

Messages

CarPlay

Maps

Music

Wallet

Apple Games

Protecting Kids Online

Accessibility

Other

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

https://support.apple.com/100100

Some features may not be available in all regions or on all iPhone models. To learn more, please visit:

https://www.apple.com/ios/feature-availability/

Software updates, like this one, add new features and improvements that may affect performance and/or battery life. To learn more, please visit:

https://support.apple.com/125039

IPSW File Download FAQ