Download iOS 9.3.3 (13G34) 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 9.3.3
Release Date 2016-07-18
Update Date 2016-07-06
Sha1sum
3fe4f22ae16a903e0fe257bb9947f6257488ccfd
Sha256sum
85ee80fd031aa642817eed9f5d00e32103ac4eb5cf914ed09c81570edc499ff8
md5sum
d8c4cefedac4bce293ef861ec99c9bec
Size 2.05 GB
FileName
iPhone8,1_9.3.3_13G34_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

iOS 9.3.3 includes bug fixes and improves the security of your iPhone or iPad.

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

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