Download iOS 12.4.3 (16G130) 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 12.4.3
Release Date 2019-10-28
Update Date 2019-10-17
Sha1sum
b783040f11c35e71fdc4d7973bdd8a29fd044fcb
Sha256sum
3311ca0f046ddfeab8652cbc43bddca6c6aa35fc64ceb5f0712d30501a7a2932
md5sum
90f923983c2c03e6a8e7bbcf2db6394e
Size 2.96 GB
FileName
iPhone_5.5_12.4.3_16G130_Restore.ipsw
Status

Download IPSW (2.96GB) Check device info
Release Notes

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

iOS 12.4.3 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