Download iOS 14.3 (18C66) for iPhone SE

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 iPhone8,4
iOS Version 14.3
Release Date 2020-12-14
Update Date 2020-12-09
Sha1sum
9b4ae780ba8c877150ca1bc75df64b45dd03eaf1
Sha256sum
0ff65eb6af1c0fe475ce5bbd15bdeb6e8547fb063b64ce09dad8ba7b644f426b
md5sum
0bb147d58175b9bbd50b2990df860219
Size 4.27 GB
FileName
iPhone_4.0_64bit_14.3_18C66_Restore.ipsw
Status

Download IPSW (4.27GB) 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