iOS 4.3.1 (8G4) for iPhone 3G[S]

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iPhone 3G[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 (420 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 3G[S] in to your PC.
  3. Open Apple Devices, and navigate to your iPhone 3G[S].
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone2,1_4.3.1_8G4_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPhone 3G[S] to reboot.

macOS

  1. Plug your iPhone 3G[S] in to your Mac.
  2. Navigate to your iPhone 3G[S] in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPhone2,1_4.3.1_8G4_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPhone 3G[S] to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPhone 3G[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 iPhone2,1_4.3.1_8G4_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPhone 3G[S] to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPhone2,1_4.3.1_8G4_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 6de986f2dbd16a65db122e7c54a70f31812d028a. 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 iPhone2,1_4.3.1_8G4_Restore.ipsw
  3. The output of the command should match the following checksum: 6de986f2dbd16a65db122e7c54a70f31812d028a. 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 iPhone2,1_4.3.1_8G4_Restore.ipsw
  3. The output of the command should match the following checksum: 6de986f2dbd16a65db122e7c54a70f31812d028a. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum4492b1a28b3e60ee2f230cb11eeae2fa9fea9ebfde26d600cc6425e1bcf3e609
MD5sum4492b1a28b3e60ee2f230cb11eeae2fa9fea9ebfde26d600cc6425e1bcf3e609
SHA1sum6de986f2dbd16a65db122e7c54a70f31812d028a
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

iOS 4.3.1 Software Update

This update contains improvements and other bug fixes including:

• Fixes an occasional graphics glitch on iPod touch (4th generation)

• Resolves bugs related to activating and connecting to some cellular networks

• Fixes image flicker when using Apple Digital AV Adapter with some TVs

• Resolves an issue authenticating with some enterprise web services

Products compatible with this software update:

• iPhone 4 (GSM model)

• iPhone 3GS

• iPad 2

• iPad

• iPod touch (4th generation)

• iPod touch (3rd generation)

This update contains security content originally included in previous iOS Software Updates. For more information, please visit this website:

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

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