macOS 12.3.1 (21E258) for Mac Studio (M1 Ultra)

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Mac Studio (M1 Ultra)

✓ This firmware is signed. This means that you can restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.

Your download should begin shortly. If it does not, you can download it directly here:

Download (13 GiB)

Windows

  1. Install the latest version of Apple Devices from the Microsoft Store.
  2. Plug your Mac Studio (M1 Ultra) in to your PC.
  3. Open Apple Devices, and navigate to your Mac Studio (M1 Ultra).
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the UniversalMac_12.3.1_21E258_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the Mac Studio (M1 Ultra) to reboot.

macOS

  1. Plug your Mac Studio (M1 Ultra) in to your Mac.
  2. Navigate to your Mac Studio (M1 Ultra) in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the UniversalMac_12.3.1_21E258_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the Mac Studio (M1 Ultra) to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your Mac Studio (M1 Ultra) in to your PC.
  3. Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
  4. To perform a full erase restore, type idevicerestore -e UniversalMac_12.3.1_21E258_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the Mac Studio (M1 Ultra) to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash UniversalMac_12.3.1_21E258_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 81033c922c5d43f57907d063fb01865f4c856b37. If it doesn't, you may need to redownload the file.

macOS

  1. Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
  2. Type openssl sha1 UniversalMac_12.3.1_21E258_Restore.ipsw
  3. The output of the command should match the following checksum: 81033c922c5d43f57907d063fb01865f4c856b37. If it doesn't, you may need to redownload the file.

Linux

  1. Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
  2. Type openssl sha1 UniversalMac_12.3.1_21E258_Restore.ipsw
  3. The output of the command should match the following checksum: 81033c922c5d43f57907d063fb01865f4c856b37. If it doesn't, you may need to redownload the file.

Checksums

SHA256sumcb0443525571ea5e54aa5a8fd9c52774591892311405183741f4a02f993e18d5
MD5sumcb0443525571ea5e54aa5a8fd9c52774591892311405183741f4a02f993e18d5
SHA1sum81033c922c5d43f57907d063fb01865f4c856b37
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