Download iOS 12.1.3 (16D39) for iPhone 5s (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 iPhone6,1
iOS Version 12.1.3
Release Date 2019-01-22
Update Date 2019-01-11
Sha1sum
e57cc111d956cc553e3d3694944b6a40da7cfea6
Sha256sum
md5sum
cb77d520c436221fa2bea9d0d8fb3e80
Size 2.87 GB
FileName
iPhone_4.0_64bit_12.1.3_16D39_Restore.ipsw
Status

Download IPSW (2.87GB) Check device info
Release Notes

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

iOS 12.1.3 includes bug fixes for your iPhone or iPad. This update:

This release also includes bug fixes for HomePod. This update:

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

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