Download iOS 12.5.3 (16H41) for iPhone 6+

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 iPhone7,1
iOS Version 12.5.3
Release Date 2021-05-03
Update Date 2021-04-29
Sha1sum
225bd6bc85e4d2d047bf0d19178f669f4823f9fc
Sha256sum
7e1088baa6fcf2256e774d7916331e2e8c8fccd41316ab96a0665ac8ca9db6f3
md5sum
a0714a2e5950d6b216647c6e4be84655
Size 2.97 GB
FileName
iPhone_5.5_12.5.3_16H41_Restore.ipsw
Status

Download IPSW (2.97GB) Check device info
Release Notes

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

This update provides important security updates and is recommended for all users.

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

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