Download iOS 15.3.1 (19D52) for iPhone X (Global)

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 iPhone10,3
iOS Version 15.3.1
Release Date 2022-02-10
Update Date 2022-02-07
Sha1sum
962ce27dd6c16824d9681172b5f2f7659ad5a16d
Sha256sum
a9a309771ccead1b24dfbccc25b6c585dbba455cbf7c8bf5440e77d8d0cd13df
md5sum
3b78c8faf9e413bb951da1d591d50e37
Size 5.52 GB
FileName
iPhone10,3,iPhone10,6_15.3.1_19D52_Restore.ipsw
Status

Download IPSW (5.52GB) 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