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iPhone 4 (GSM)

iOS 4.0.1 (8A306) for iPhone 4 (GSM)

✗ This firmware is not signed. This means you cannot restore to it in iTunes.

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Download (607 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 (GSM) in to your PC.
  3. Open iTunes, and navigate to your iPhone 4 (GSM).
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone3,1_4.0.1_8A306_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPhone 4 (GSM) to reboot.

macOS

  1. Plug your iPhone 4 (GSM) in to your Mac.
  2. Navigate to your iPhone 4 (GSM) in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPhone3,1_4.0.1_8A306_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPhone 4 (GSM) to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPhone 4 (GSM) 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 iPhone3,1_4.0.1_8A306_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPhone 4 (GSM) to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPhone3,1_4.0.1_8A306_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 262fc637585a599b3626336db58855e6494e1081. 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 iPhone3,1_4.0.1_8A306_Restore.ipsw
  3. The output of the command should match the following checksum: 262fc637585a599b3626336db58855e6494e1081. 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 iPhone3,1_4.0.1_8A306_Restore.ipsw
  3. The output of the command should match the following checksum: 262fc637585a599b3626336db58855e6494e1081. If it doesn't, you may need to redownload the file.

Checksums

MD5sum 40ebacb47fb32d7f33ba0fd596e150e9
SHA1sum 262fc637585a599b3626336db58855e6494e1081
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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