Download iOS 8.1.3 (12B466) 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 8.1.3
Release Date 2015-01-27
Update Date 2015-01-19
Sha1sum
1f6d320483f0a0f76236a4b4bbb358803406249f
Sha256sum
5499fb5ec05f1dc57d019c1ceb328fb1ac07ae2ed573aaff05fb84a40f37aa82
md5sum
f1b75061132f33fa17f7837bfe4a5bc9
Size 1.74 GB
FileName
iPhone6,1_8.1.3_12B466_Restore.ipsw
Status

Download IPSW (1.74GB) Check device info
Release Notes

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

This release includes bug fixes, increased stability and performance improvements, including:

For information on the security content of this update, please visit this website:

http://support.apple.com/kb/HT1222