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iPhone 12 Pro Max

iOS 17.2.1 (21C66) for iPhone 12 Pro Max

✗ This firmware is not signed. This means you cannot restore to it in iTunes.

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

Download (7.78 GB)

✗ This firmware is not signed. This means you cannot restore to it in iTunes. The instructions below are included for reference only.

Windows

  1. Install the latest version of iTunes from the Microsoft Store.
  2. Plug your iPhone 12 Pro Max in to your PC.
  3. Open iTunes, and navigate to your iPhone 12 Pro Max.
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone13,4_17.2.1_21C66_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPhone 12 Pro Max to reboot.

macOS

  1. Plug your iPhone 12 Pro Max in to your Mac.
  2. Navigate to your iPhone 12 Pro Max in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPhone13,4_17.2.1_21C66_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPhone 12 Pro Max to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPhone 12 Pro Max 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 iPhone13,4_17.2.1_21C66_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPhone 12 Pro Max to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPhone13,4_17.2.1_21C66_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 2a31d3bbab2031bcd7b0cd6620b8874bf0e3d2cf. 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 iPhone13,4_17.2.1_21C66_Restore.ipsw
  3. The output of the command should match the following checksum: 2a31d3bbab2031bcd7b0cd6620b8874bf0e3d2cf. 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 iPhone13,4_17.2.1_21C66_Restore.ipsw
  3. The output of the command should match the following checksum: 2a31d3bbab2031bcd7b0cd6620b8874bf0e3d2cf. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum e54c05c5a383ba9845713b057117e56d576fca3601d892f1f36ef635b050731e
MD5sum accd4718bc2111e9a0cd9d5b86cb0c03
SHA1sum 2a31d3bbab2031bcd7b0cd6620b8874bf0e3d2cf
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

This update provides important bug fixes and is recommended for all users.

For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/kb/HT201222

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