macOS 15.1.1 (24B91) for iMac 24-inch (M1, Two Ports, 2021)

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iMac 24-inch (M1, Two Ports, 2021)

✓ 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 (15 GiB)

Windows

  1. Install the latest version of Apple Devices from the Microsoft Store.
  2. Plug your iMac 24-inch (M1, Two Ports, 2021) in to your PC.
  3. Open Apple Devices, and navigate to your iMac 24-inch (M1, Two Ports, 2021).
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the UniversalMac_15.1.1_24B91_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iMac 24-inch (M1, Two Ports, 2021) to reboot.

macOS

  1. Plug your iMac 24-inch (M1, Two Ports, 2021) in to your Mac.
  2. Navigate to your iMac 24-inch (M1, Two Ports, 2021) in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the UniversalMac_15.1.1_24B91_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iMac 24-inch (M1, Two Ports, 2021) to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iMac 24-inch (M1, Two Ports, 2021) 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_15.1.1_24B91_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iMac 24-inch (M1, Two Ports, 2021) to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash UniversalMac_15.1.1_24B91_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: b515c07a7322d27f9bc672ef40bc6e3d1b09bea3. 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_15.1.1_24B91_Restore.ipsw
  3. The output of the command should match the following checksum: b515c07a7322d27f9bc672ef40bc6e3d1b09bea3. 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_15.1.1_24B91_Restore.ipsw
  3. The output of the command should match the following checksum: b515c07a7322d27f9bc672ef40bc6e3d1b09bea3. If it doesn't, you may need to redownload the file.

Checksums

SHA256sumf94fb7f03c9fe52d573ff58db9e2c8481cec25fd1a29fe4932f60a6c8c1151e7
MD5sumf94fb7f03c9fe52d573ff58db9e2c8481cec25fd1a29fe4932f60a6c8c1151e7
SHA1sumb515c07a7322d27f9bc672ef40bc6e3d1b09bea3
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