Download iOS 9.2.1 (13D15) 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 9.2.1
Release Date 2016-01-19
Update Date 2016-01-12
Sha1sum
ecf03303ed8d9312cbf0e226ca407c1e643f30b2
Sha256sum
bf82995870bb8cb72b362f8a100460e8333afeab5f60a72a7f4afea01ae8ee69
md5sum
9a71347e9d6dddb2874158b2202968b1
Size 1.81 GB
FileName
iPhone6,1_9.2.1_13D15_Restore.ipsw
Status

Download IPSW (1.81GB) Check device info
Release Notes

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

This update contains security updates and bug fixes including a fix for an issue that could prevent the completion of app installation when using an MDM server.

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

https://support.apple.com/HT201222