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iPhone 3G

iOS 4.2.1 (8C148) for iPhone 3G

✓ This firmware is signed. This means that you can restore to it in iTunes.

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

Download (339 MB)

Windows

  1. Install the latest version of iTunes from the Microsoft Store.
  2. Plug your iPhone 3G in to your PC.
  3. Open iTunes, and navigate to your iPhone 3G.
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone1,2_4.2.1_8C148_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_4.2.1_8C148_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_4.2.1_8C148_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_4.2.1_8C148_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: d2ed58586e8ca2153f2e2ec585bba8afc5173378. 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_4.2.1_8C148_Restore.ipsw
  3. The output of the command should match the following checksum: d2ed58586e8ca2153f2e2ec585bba8afc5173378. 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_4.2.1_8C148_Restore.ipsw
  3. The output of the command should match the following checksum: d2ed58586e8ca2153f2e2ec585bba8afc5173378. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum 98e5969c3baed660c9a26e94cd7ed4b3cdb7175900f448bcc2223bf885835ce0
MD5sum 8b1657935408a1638b69740b282f62b3
SHA1sum d2ed58586e8ca2153f2e2ec585bba8afc5173378
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