Download iOS 17.2.1 (21C66) 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 17.2.1
Release Date 2023-12-19
Update Date 2023-12-16
Sha1sum
58dc999bef44377984061fff9db90a9a0af1f562
Sha256sum
9edf3cd85b49d7855dcae45a9ac9811d9d7b8d8839aabd88392d4f955fe74407
md5sum
0ad00ece3f7abe0cbcbf9899eca894e8
Size 7.40 GB
FileName
iPhone15,4_17.2.1_21C66_Restore.ipsw
Status

Download IPSW (7.40GB) Check device info
Release Notes

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

Phone

Messages

FaceTime

StandBy

Widgets

AirDrop

Keyboard

Safari and Passwords

Music

AirPlay

AirPods

Maps

Siri

Visual Look Up

Health

Privacy

Accessibility

This release also includes other features and improvements:

Some features may not be available for all regions or on all Apple devices. For more information, please visit this website:

https://www.apple.com/ios/ios-17

Some features may not be available for all regions or on all iPhone models. For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/kb/HT201222