Download iOS 9.3.5 (13G36) 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 iPhone7,2
iOS Version 9.3.5
Release Date 2016-08-25
Update Date 2016-08-20
Sha1sum
7e192c37caf5b49c5f6724888c7841c942253565
Sha256sum
5d5fae7171ca50d32aca97ce126a83f8375376f5e53d15f8afbe7b2e0c0031b3
md5sum
1c110a96d8f8828da490933a2b7db86c
Size 1.88 GB
FileName
iPhone7,2_9.3.5_13G36_Restore.ipsw
Status

Download IPSW (1.88GB) Check device info
Release Notes

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

iOS 9.3.5 provides an important security update for your iPhone or iPad 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