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iPhone 3G[S]

iOS 4.2.1 (8C148a) for iPhone 3G[S]

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

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Download (421 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 3G[S] in to your PC.
  3. Open iTunes, and navigate to your iPhone 3G[S].
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone2,1_4.2.1_8C148a_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_4.2.1_8C148a_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_4.2.1_8C148a_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_4.2.1_8C148a_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 2787bb9fbf18594279d05682e6fd16d2b9612a2a. 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_4.2.1_8C148a_Restore.ipsw
  3. The output of the command should match the following checksum: 2787bb9fbf18594279d05682e6fd16d2b9612a2a. 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_4.2.1_8C148a_Restore.ipsw
  3. The output of the command should match the following checksum: 2787bb9fbf18594279d05682e6fd16d2b9612a2a. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum 09f3617fcf3e419e12c4a3c62f1fe0ab3909d0573a00937584124f869a7df15d
MD5sum d688d2d48c8b054367adef8e7ab4f5ea
SHA1sum 2787bb9fbf18594279d05682e6fd16d2b9612a2a
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