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 iPhone7,1
iOS Version 9.3.5
Release Date 2016-08-25
Update Date 2016-08-20
Sha1sum
546a89d6676c5990b6bc5df86d1f394cb0548a47
Sha256sum
3e51b7671999566b67a3eaeb61b3da07f8411d0be6f746f787da4ed0a831b1ea
md5sum
52e12b007d34877971743f76244dd31e
Size 2.08 GB
FileName
iPhone7,1_9.3.5_13G36_Restore.ipsw
Status

Download IPSW (2.08GB) 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