IPSW Downloads

iOS 4.2.1 - 8C148 for iPhone 3G

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

Release DateInvalid Date
Upload Date18 November 2010
File NameiPhone1,2_4.2.1_8C148_Restore.ipsw
File Size0.32 GB
SHA256sum98e5969c3baed660c9a26e94cd7ed4b3cdb7175900f448bcc2223bf885835ce0
MD5sum8b1657935408a1638b69740b282f62b3
SHA1sumd2ed58586e8ca2153f2e2ec585bba8afc5173378
IdentifieriPhone1,2

Installation Instructions

Windows

  1. Install the latest version of iTunes from the Microsoft Store.
  2. Connect your iPhone 3G to your PC.
  3. Open iTunes and navigate to your iPhone 3G.
  4. Hold the Shift key and click "Restore".
  5. Select the iPhone1,2_4.2.1_8C148_Restore.ipsw file you downloaded.
  6. Wait for the restore to complete and for your iPhone 3G to reboot.

macOS

  1. Connect your iPhone 3G to your Mac.
  2. Navigate to your iPhone 3G in Finder.
  3. Hold the Option or Alt key and click "Restore".
  4. Select the iPhone1,2_4.2.1_8C148_Restore.ipsw file you downloaded.
  5. Wait for the restore to complete and for your iPhone 3G to reboot.

Linux

  1. Install idevicerestore.
  2. Connect your iPhone 3G to your PC.
  3. Open a terminal and navigate to the IPSW file 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 for your iPhone 3G to reboot.