Download iOS 26.4 (23E246) 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 Signed

Firmware Identifier iPhone15,4
iOS Version 26.4
Release Date 2026-03-24
Update Date 2026-03-21
Sha1sum
3d086eb182677066be3f96b4dac166faed83bc2f
Sha256sum
c1ce60947cf850ab7e31fb53ef1e70941ad0390af143344ffb25db74ffade497
md5sum
f60926431251510bc4df0ca5404db702
Size 9.64 GB
FileName
iPhone15,4_26.4_23E246_Restore.ipsw
Status

Download IPSW (9.64GB) Check device info
Release Notes

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

Apple Music

Accessibility

This update also includes the following enhancements:

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