Download iOS 9.3.3 (13G34) for iPhone 5s (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 iPhone6,1
iOS Version 9.3.3
Release Date 2016-07-18
Update Date 2016-07-06
Sha1sum
2507701270db1f54714f6c956dd52ffb7cebe214
Sha256sum
028f3c9850f16a58df0f9ef2db2263e7dba4d29ce89960cc431432e952179a9c
md5sum
69bfa6138c07997e6277043b5194b2a3
Size 1.85 GB
FileName
iPhone6,1_9.3.3_13G34_Restore.ipsw
Status

Download IPSW (1.85GB) 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