iPhone XS iPhone11,2

IPSW Unsigned 18C66

iOS 14.3

iOS

Version

14.3

Build ID

18C66

File Size

5.92 GB

Release Date

2020-12-14

Last Updated

2020-12-09

Download IPSW

Beta firmware? Download Here →

Want full hardware specs? View iPhone XS specs →

About This Firmware

iOS 14.3 (build 18C66) is an official Apple IPSW for the iPhone XS, released on 2020-12-14. The file is served directly from Apple's CDN. This firmware is no longer signed by Apple. Standard downgrades are not possible, but the file remains available for reference and advanced use.

Verify the download using the SHA-256 or SHA-1 checksum listed in the Checksums section below.

Filename

iPhone11,2,iPhone11,4,iPhone11,6,iPhone12,3,iPhone12,5_14.3_18C66_Restore.ipsw

Checksums

SHA-256 cd08c22a4cc2e234b9fabd1dcd6e752b5eb689cad6afef0b8e44e2861cbaeed2

SHA-1 2938954dd34ecdd9aab2d10bae05524a3b634f4b

MD5 2087e626b6f7de85d1848adec262bb3c

Direct URL

https://updates.cdn-apple.com/2020WinterFCS/fullrestores/001-87493/276DDA26-A771-413E-8BAF-FD7409E1897C/iPhone11,2,iPhone11,4,iPhone11,6,iPhone12,3,iPhone12,5_14.3_18C66_Restore.ipsw

Other Devices

iPhone 7 Plus (Global)

How to Restore with This IPSW

iTunes / Finder

macOS & Windows

Download the .ipsw file to your computer.
Connect your iPhone XS via USB.
Open iTunes (Windows / macOS Mojave and earlier) or Finder (macOS Catalina+) and select your device.
Update (keep data): hold Option (Mac) or Shift (Windows) and click Update, then pick the .ipsw file.
Restore (erase & install): hold Option / Shift and click Restore iPhone…, then pick the .ipsw file.
Wait for the process to finish - do not disconnect.

Restoring will erase all data on the device. Back up first.

3uTools

Windows

Download and install 3uTools from 3u.com.
Connect your iPhone XS via USB and trust the computer on the device.
Go to Flash & JB → Easy Flash.
Click Import and select the downloaded .ipsw file.
Choose Flash mode: Update keeps data, Restore wipes the device.
Click Flash and wait for the progress bar to complete - do not disconnect.

Only flash firmware that matches your exact device model.

DFU Mode

Recovery tip

If your device is stuck in a boot loop or iTunes/Finder does not recognise it, enter DFU mode first, then select the .ipsw file as normal.

iPhone 8 / X and later

Quickly press & release Volume Up
Quickly press & release Volume Down
Hold Side button until screen goes black
Hold Side + Volume Down for 5 s
Release Side, hold Volume Down 5 more s
Black screen = DFU active

iPhone 7 / 7 Plus

Hold Sleep/Wake + Volume Down for 8 s
Release Sleep/Wake, keep holding Volume Down for 5 s
Black screen = DFU active

iPhone 6s and earlier

Hold Sleep/Wake + Home for 8 s
Release Sleep/Wake, keep holding Home for 5 s
Black screen = DFU active