Download iOS 14.3 (18C66) for iPhone 6s+

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 iPhone8,2
iOS Version 14.3
Release Date 2020-12-14
Update Date 2020-12-09
Sha1sum
4d3ae504d0b117caf594d10b6fe12766f8179e45
Sha256sum
38fcb191f4d5c25ca7be72ccac559ace385ccadba018608bb1c86c1ea4b54e1f
md5sum
927f8f8ecfb6946e6234d69dd667161f
Size 4.50 GB
FileName
iPhone_5.5_14.3_18C66_Restore.ipsw
Status

Download IPSW (4.50GB) Check device info
Release Notes

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

iOS 14.3 includes support for Apple Fitness+ and AirPods Max. This release also adds the ability to capture photos in Apple ProRAW on iPhone 12 Pro, introduces Privacy information on the App Store, and includes other features and bug fixes for your iPhone.

Apple Fitness+

AirPods Max

Photos

Privacy

TV app

App Clips

Health

Weather

Safari

This release also addresses the following issues:

Some features may not be available for all regions or on all Apple devices. For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/kb/HT201222