Download iOS 14.3 (18C66) for iPhone SE (2020)

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 iPhone12,8
iOS Version 14.3
Release Date 2020-12-14
Update Date 2020-12-09
Sha1sum
bb67f6ca937261185e4a62eb78514197f06f78d3
Sha256sum
8036689c95ac2138464ed19cc2febe5e33ac4f69ecc243a63e75a8c9c978ec04
md5sum
d0da7506ddd5a1c077d66f1237972da2
Size 4.80 GB
FileName
iPhone12,8_14.3_18C66_Restore.ipsw
Status

Download IPSW (4.80GB) 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