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iPhone 4[S]

iOS 8.1.1 (12B435) 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 (1.56 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 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_8.1.1_12B435_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_8.1.1_12B435_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_8.1.1_12B435_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_8.1.1_12B435_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 941857f93e46e2ba58fb4bac45b74abd0b711b0b. 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_8.1.1_12B435_Restore.ipsw
  3. The output of the command should match the following checksum: 941857f93e46e2ba58fb4bac45b74abd0b711b0b. 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_8.1.1_12B435_Restore.ipsw
  3. The output of the command should match the following checksum: 941857f93e46e2ba58fb4bac45b74abd0b711b0b. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum dc530517c12b4694e25a446ded5ffab546863f7fbe78a32b91ac5e7582d7bf83
MD5sum dc1284b8b00c20e10731fe652cece405
SHA1sum 941857f93e46e2ba58fb4bac45b74abd0b711b0b
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

This release includes bug fixes, increased stability and performance improvements for iPad 2 and iPhone 4s.

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

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

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