iOS 4.0.1 (8A306) for iPhone 3G

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iPhone 3G

✗ This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.

Your download should begin shortly. If it does not, you can download it directly here:

Download (305 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 in to your PC.
  3. Open Apple Devices, and navigate to your iPhone 3G.
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone1,2_4.0.1_8A306_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPhone 3G to reboot.

macOS

  1. Plug your iPhone 3G in to your Mac.
  2. Navigate to your iPhone 3G in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPhone1,2_4.0.1_8A306_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPhone 3G to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPhone 3G 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 iPhone1,2_4.0.1_8A306_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPhone 3G to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPhone1,2_4.0.1_8A306_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 940bd2b36c646f6673419eab661ac1f13248e592. 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 iPhone1,2_4.0.1_8A306_Restore.ipsw
  3. The output of the command should match the following checksum: 940bd2b36c646f6673419eab661ac1f13248e592. 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 iPhone1,2_4.0.1_8A306_Restore.ipsw
  3. The output of the command should match the following checksum: 940bd2b36c646f6673419eab661ac1f13248e592. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum6d3f2c695229d03b4fe9297c681ffb509eaf5f1d4a316af893d15f674f330a52
MD5sum6d3f2c695229d03b4fe9297c681ffb509eaf5f1d4a316af893d15f674f330a52
SHA1sum940bd2b36c646f6673419eab661ac1f13248e592
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

iOS 4.0.1 Software Update for iPhone

This update contains bug fixes and improvements, including the following:

• Improves the formula to determine how many bars of signal strength to display

Products compatible with this software update:

• iPhone 3G

• iPhone 3GS

• iPhone 4

For feature descriptions and complete instructions, see the user guides for iPhone at:

http://support.apple.com/manuals/iphone

For more information about iPhone, go to:

http://www.apple.com/iphone

To troubleshoot your iPhone, or to view additional support information go to:

http://www.apple.com/support/iphone

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

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

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