iOS 5.1 (9B176) for iPod touch 4

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iPod touch 4

✗ 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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Download (750 MiB)

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 iPod touch 4 in to your PC.
  3. Open Apple Devices, and navigate to your iPod touch 4.
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPod4,1_5.1_9B176_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPod touch 4 to reboot.

macOS

  1. Plug your iPod touch 4 in to your Mac.
  2. Navigate to your iPod touch 4 in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPod4,1_5.1_9B176_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPod touch 4 to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPod touch 4 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 iPod4,1_5.1_9B176_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPod touch 4 to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPod4,1_5.1_9B176_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 65d7ee2d2fa505ce6fe91271f84f3fc9cbcc81a1. 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 iPod4,1_5.1_9B176_Restore.ipsw
  3. The output of the command should match the following checksum: 65d7ee2d2fa505ce6fe91271f84f3fc9cbcc81a1. 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 iPod4,1_5.1_9B176_Restore.ipsw
  3. The output of the command should match the following checksum: 65d7ee2d2fa505ce6fe91271f84f3fc9cbcc81a1. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum22022f4bb003deb24189063692c478d74275dcb1e1b2b7df30cbe6d01048b167
MD5sum22022f4bb003deb24189063692c478d74275dcb1e1b2b7df30cbe6d01048b167
SHA1sum65d7ee2d2fa505ce6fe91271f84f3fc9cbcc81a1
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

iOS 5.1

This update contains improvements and bug fixes, including:

  • Japanese language support for Siri (availability may be limited during initial rollout)

  • Photos can now be deleted from Photo Stream

  • Camera shortcut now always visible on Lock Screen for iPhone 4S, iPhone 4, iPhone 3GS and iPod touch (4th generation)

  • Camera face detection now highlights all detected faces

  • Redesigned Camera app for iPad

  • Genius Mixes and Genius playlists for iTunes Match subscribers

  • Audio for TV shows and movies on iPad optimized to sound louder and clearer

  • Podcast controls for playback speed and a 30 second rewind for iPad

  • Updated AT&T network indicator

  • Addresses bugs affecting battery life

  • Fixes an issue that occasionally caused audio to drop for outgoing calls

For information on the security content of this update, please visit this website:

http://support.apple.com/kb/HT1222

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