Download iOS 8.3 (12F70) 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 8.3
Release Date 2015-04-08
Update Date 2015-04-04
Sha1sum
8f1f74f652830b63468dc0c6f12af6d318df8d7f
Sha256sum
b89f91212b9ca966be93f403adc410deff803c87e725b3820cb67f0fd7e4fb83
md5sum
c9614310b6e21ebf1d5ecf0c8af7097d
Size 1.77 GB
FileName
iPhone6,1_8.3_12F70_Restore.ipsw
Status

Download IPSW (1.77GB) Check device info
Release Notes

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

This release includes improved performance, bug fixes, and a redesigned Emoji keyboard. Changes include:

Improved performance for:

Wi-Fi and Bluetooth fixes

Orientation and rotation fixes

Messages fixes

Family Sharing fixes

CarPlay fixes

Enterprise fixes

Accessibility fixes

Other improvements and bug fixes

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

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