Download iOS 9.3.3 (13G34) for iPhone 4[S]

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 iPhone4,1
iOS Version 9.3.3
Release Date 2016-07-18
Update Date 2016-07-06
Sha1sum
6ebea01a3854c6d005f2fd729891f7f45734a05d
Sha256sum
36a4811b75070ccd8880966848a4d52b72c499cc4b5b005b77020d5164644596
md5sum
5cd1ac5e9c7626fe7bb96b479d2e668f
Size 1.50 GB
FileName
iPhone4,1_9.3.3_13G34_Restore.ipsw
Status

Download IPSW (1.50GB) 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