Download iOS 13.1.3 (17A878) for iPhone 8 (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 iPhone10,4
iOS Version 13.1.3
Release Date 2019-10-15
Update Date 2019-10-10
Sha1sum
8f0623c9a52feeb92627012fa8a9731de88770ab
Sha256sum
27d6853b409786e02e9b0c0a3a8bcff0cccab63a63b5dd2bc0e018d62a9cfbfa
md5sum
e816024db4d2d78389f0d336d88dfae9
Size 3.67 GB
FileName
iPhone_4.7_P3_13.1.3_17A878_Restore.ipsw
Status

Download IPSW (3.67GB) Check device info
Release Notes

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

iOS 13.1.3 includes bug fixes and improvements for your iPhone. This update:

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

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