Download iOS 9.2.1 (13D15) for iPhone 6

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 iPhone7,2
iOS Version 9.2.1
Release Date 2016-01-19
Update Date 2016-01-12
Sha1sum
42ea71546dd22ccc2516fc2e5cf90a2c3e563462
Sha256sum
cfce26a785dc560343906065cdb3291a4ee0d67b2a33436ca5f6e6c4ffee9eb0
md5sum
4b2482c735515a3d3f336b23f7e5a4fd
Size 1.84 GB
FileName
iPhone7,2_9.2.1_13D15_Restore.ipsw
Status

Download IPSW (1.84GB) 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