Download iOS 15.3.1 (19D52) for iPhone XR

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 iPhone11,8
iOS Version 15.3.1
Release Date 2022-02-10
Update Date 2024-06-03
Sha1sum
2eb9be02c82b5f60d37c83e78e85255b07de279e
Sha256sum
cd351c6bfe9fa2b982d832c6aefebc2efc43db4c3bb9743c53a004b3c0b494e7
md5sum
f4d564c92605f6875029902256c3f0d4
Size 6.50 GB
FileName
iPhone11,8,iPhone12,1_15.3.1_19D52_Restore.ipsw
Status

Download IPSW (6.50GB) 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