Download iOS 11.3.1 (15E302) for iPhone X (GSM)

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 iPhone10,6
iOS Version 11.3.1
Release Date 2018-04-24
Update Date 2018-04-14
Sha1sum
be04218488a3b785174664ba8914968cb0b3fcee
Sha256sum
b3171295fca02ad3db9dee3cb4938a0c38dc5bffd060078a769110a2831f27c3
md5sum
2326762ec1d883334eaa709b47099254
Size 2.77 GB
FileName
iPhone10,3,iPhone10,6_11.3.1_15E302_Restore.ipsw
Status

Download IPSW (2.77GB) Check device info
Release Notes

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

iOS 11.3.1 improves the security of your iPhone or iPad and addresses an issue where touch input was unresponsive on some iPhone 8 devices because they were serviced with non-genuine replacement displays.

Note: Non-genuine replacement displays may have compromised visual quality and may fail to work correctly. Apple-certified screen repairs are performed by trusted experts who use genuine Apple parts. See support.apple.com for more information.

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

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