About This Firmware
macOS 14.2.1
(build 23C71) is an official Apple IPSW
for the MacBook Pro (M1 Max, 16-inch, 2021),
released on 2023-12-19.
The file is served directly from Apple's CDN.
This firmware is currently signed by Apple, so it can be used to restore or update your device via iTunes or Finder.
Verify the download using the checksums below.
Filename
UniversalMac_14.2.1_23C71_Restore.ipsw
Checksums
SHA-256
7e444e1a31b89b497271019537f9c8b8081d5287ecb08562a3a6ac5f3d9ec66f
SHA-1
99cd8a7f909957bab3a051022ace3420216f17f2
MD5
61be6c7201166ad57b0638e03df91721
Direct URL
https://updates.cdn-apple.com/2023FallFCS/fullrestores/052-22662/ECE59A41-DACC-4CA5-AB23-FDED1A4567DE/UniversalMac_14.2.1_23C71_Restore.ipsw
Other Devices
MacBook Pro (14-inch, M5 Max)
Mac17,7
iMac (Four Ports, 24-inch, 2023)
Mac15,5
Mac Studio (2025)
Mac16,9
iMac (Two Ports, 24-inch, 2023)
Mac15,4
MacBook Pro (M4 Pro, 16-inch, Nov 2024)
Mac16,7
MacBook Pro (M3 Max, 14-inch, Nov 2023)
Mac15,8
How to Restore with This IPSW
iTunes / Finder
macOS & Windows- Download the .ipsw file to your computer.
- Connect your MacBook Pro (M1 Max, 16-inch, 2021) 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 MacBook Pro (M1 Max, 16-inch, 2021) 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 tipIf 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