iOS 5.1 (9B179) for iPhone 4[S]

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iPhone 4[S]

✗ 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 (803 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 iPhone 4[S] in to your PC.
  3. Open Apple Devices, and navigate to your iPhone 4[S].
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone4,1_5.1_9B179_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPhone 4[S] to reboot.

macOS

  1. Plug your iPhone 4[S] in to your Mac.
  2. Navigate to your iPhone 4[S] in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPhone4,1_5.1_9B179_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPhone 4[S] to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPhone 4[S] 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 iPhone4,1_5.1_9B179_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPhone 4[S] to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPhone4,1_5.1_9B179_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 73e56b97c2ab7924f22f1488e65983720a46b5c8. 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 iPhone4,1_5.1_9B179_Restore.ipsw
  3. The output of the command should match the following checksum: 73e56b97c2ab7924f22f1488e65983720a46b5c8. 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 iPhone4,1_5.1_9B179_Restore.ipsw
  3. The output of the command should match the following checksum: 73e56b97c2ab7924f22f1488e65983720a46b5c8. If it doesn't, you may need to redownload the file.

Checksums

SHA1sum73e56b97c2ab7924f22f1488e65983720a46b5c8
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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