Download iOS 9.3.1 (13E238) for iPhone 6s

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 iPhone8,1
iOS Version 9.3.1
Release Date 2016-03-31
Update Date 2016-03-30
Sha1sum
1005ae855541354fe777ae818f1fa9e89be9d8cb
Sha256sum
d84261b4b6f23dd04a0548f9dfda8212c0fed535505e77cd511a200a5908f410
md5sum
9bac589f2bc11b74597d41f7aad6876b
Size 2.05 GB
FileName
iPhone8,1_9.3.1_13E238_Restore.ipsw
Status

Download IPSW (2.05GB) Check device info
Release Notes

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

Fixes an issue that caused apps to be unresponsive after tapping on links in Safari and other apps

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

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