Download iOS 15.3.1 (19D52) for iPhone XS

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 iPhone11,2
iOS Version 15.3.1
Release Date 2022-02-10
Update Date 2022-02-07
Sha1sum
ae8469c2f4ecc6e825a5ab9368d843469524be21
Sha256sum
c69c2d6200198229f371dc0cf49b9aff914a49d35bbc5bb9baff2b42555e09b7
md5sum
65ce30688c78608e81f50023cb64f641
Size 7.01 GB
FileName
iPhone11,2,iPhone11,4,iPhone11,6,iPhone12,3,iPhone12,5_15.3.1_19D52_Restore.ipsw
Status

Download IPSW (7.01GB) Check device info
Release Notes

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

iOS 15.3.1 provides important security updates for your iPhone and fixes an issue that may cause Braille displays to stop responding.

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

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