iPadOS 17.5.1 (21F90) for iPad Air 4 (Cellular)

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iPad Air 4 (Cellular)

✗ This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.

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This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore. The instructions below are included for reference only.

Windows

  1. Install the latest version of Apple Devices from the Microsoft Store.
  2. Plug your iPad Air 4 (Cellular) in to your PC.
  3. Open Apple Devices, and navigate to your iPad Air 4 (Cellular).
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPad_Fall_2020_17.5.1_21F90_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPad Air 4 (Cellular) to reboot.

macOS

  1. Plug your iPad Air 4 (Cellular) in to your Mac.
  2. Navigate to your iPad Air 4 (Cellular) in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPad_Fall_2020_17.5.1_21F90_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPad Air 4 (Cellular) to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPad Air 4 (Cellular) 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 iPad_Fall_2020_17.5.1_21F90_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPad Air 4 (Cellular) to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPad_Fall_2020_17.5.1_21F90_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 9150827c5163d851daa2f865cc14de958c31bc04. 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 iPad_Fall_2020_17.5.1_21F90_Restore.ipsw
  3. The output of the command should match the following checksum: 9150827c5163d851daa2f865cc14de958c31bc04. 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 iPad_Fall_2020_17.5.1_21F90_Restore.ipsw
  3. The output of the command should match the following checksum: 9150827c5163d851daa2f865cc14de958c31bc04. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum90d9a72cbf0d03fb83067c25a212ec8f8cc5aba26da581ab7549505863bd6661
MD5sum90d9a72cbf0d03fb83067c25a212ec8f8cc5aba26da581ab7549505863bd6661
SHA1sum9150827c5163d851daa2f865cc14de958c31bc04
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 addresses a rare issue where photos that experienced database corruption could reappear in the Photos library even if they were deleted.

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