Mac Studio (M1 Ultra)
Mac13,2
About This Firmware
macOS 12.3
(build 21E230) is an official Apple IPSW
for the Mac Studio (M1 Ultra),
released on 2022-03-14.
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 SHA-256 or SHA-1 checksum listed in the Checksums section below.
Filename
UniversalMac_12.3_21E230_Restore.ipsw
Checksums
SHA-256
0ceb505082b254d14a7eef406b48671c0abd7c943d25fa75ea2807ea17504006
SHA-1
b9e895b403586591040864d23643132c20ca7913
MD5
ebc5b2018be0ae7833d528f22e4d2249
Direct URL
https://updates.cdn-apple.com/2022SpringFCS/fullrestores/071-08757/74A4F2A1-C747-43F9-A22A-C0AD5FB4ECB6/UniversalMac_12.3_21E230_Restore.ipsw
Other Devices
MacBook Air (15-inch, M4, 2025)
Mac16,13
MacBook Pro (M1 Max, 16-inch, 2021)
MacBookPro18,2
MacBook Pro (M2 Max, 14-inch, 2023)
Mac14,5
Mac Studio (2025)
Mac16,9
MacBook Pro (M1 Pro, 16-inch, 2021)
MacBookPro18,1
MacBook Air (M1, Late 2020)
MacBookAir10,1
How to Restore with This IPSW
iTunes / Finder
macOS & Windows- Download the .ipsw file to your computer.
- Connect your Mac Studio (M1 Ultra) 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 Mac Studio (M1 Ultra) 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