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iPhone 4[S]

iOS 5.1.1 (9B206) for iPhone 4[S]

✗ 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 (842 MB)

✗ 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 4[S] in to your PC.
  3. Open iTunes, and navigate to your iPhone 4[S].
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone4,1_5.1.1_9B206_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_5.1.1_9B206_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_5.1.1_9B206_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_5.1.1_9B206_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: ac99928cc52fcb24502959ace3c36a63ba75ab6c. 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_5.1.1_9B206_Restore.ipsw
  3. The output of the command should match the following checksum: ac99928cc52fcb24502959ace3c36a63ba75ab6c. 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_5.1.1_9B206_Restore.ipsw
  3. The output of the command should match the following checksum: ac99928cc52fcb24502959ace3c36a63ba75ab6c. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum b6870acf127a58e2775f93b9314cc678ac39caed7f0cbd13699f5f3a09c6f277
MD5sum 50d2ef6d24b99525786aea25bb1f69cf
SHA1sum ac99928cc52fcb24502959ace3c36a63ba75ab6c
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

This update contains improvements and bug fixes, including:

  • Improves reliability of using HDR option for photos taken using the Lock Screen shortcut
  • Addresses bugs that could prevent the new iPad from switching between 2G and 3G networks
  • Fixes bugs that affected AirPlay video playback in some circumstances
  • Improved reliability for syncing Safari bookmarks and Reading List
  • Fixes an issue where 'Unable to purchase' alert could be displayed after successful purchase

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

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

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