Download iOS 9.3 (13E233) 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
Release Date 2016-03-21
Update Date 2016-03-15
Sha1sum
989b535c7c5266f215752f3ac4de5a5f85e95784
Sha256sum
bc025f1924ef78100ce5ac0d63a4371ccaa86e632c96cb8e4d81432f072d14cf
md5sum
885599c9c52db8ca2be5f5f7f59cffda
Size 1.50 GB
FileName
iPhone4,1_9.3_13E233_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

With this update your iPhone, iPad and iPod touch gain improvements to Notes, News, Health, Apple Music and a new feature called Night Shift that may even help you get a better night’s sleep by shifting the colors in your display to the warmer end of the spectrum at night. New features, improvements, and bug fixes include:

Night Shift

Notes improvements

News improvements

Health improvements

Apple Music improvements

Photos improvements

iBooks improvements

Education improvements

CarPlay improvements

Dolby Digital Plus

Hardware keyboard improvements and fixes

Other improvements

Enterprise bug fixes

Accessibility bug fixes

Other bug fixes, performance and stability improvements

Some features may not be available for all countries or all areas, for more information visit: http://www.apple.com/ios/feature-availability and http://www.apple.com/ios/updates/

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

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