IPSW Downloads

iOS 4.3.1 - 8G4 for iPhone 3GS

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

Release DateInvalid Date
Upload Date24 March 2011
File NameiPhone2,1_4.3.1_8G4_Restore.ipsw
File Size0.41 GB
SHA256sum4492b1a28b3e60ee2f230cb11eeae2fa9fea9ebfde26d600cc6425e1bcf3e609
MD5sum694c93b5b608513136ba8956dff28ba7
SHA1sum6de986f2dbd16a65db122e7c54a70f31812d028a
IdentifieriPhone2,1

Installation Instructions

Windows

  1. Install the latest version of iTunes from the Microsoft Store.
  2. Connect your iPhone 3GS to your PC.
  3. Open iTunes and navigate to your iPhone 3GS.
  4. Hold the Shift key and click "Restore".
  5. Select the iPhone2,1_4.3.1_8G4_Restore.ipsw file you downloaded.
  6. Wait for the restore to complete and for your iPhone 3GS to reboot.

macOS

  1. Connect your iPhone 3GS to your Mac.
  2. Navigate to your iPhone 3GS in Finder.
  3. Hold the Option or Alt key and click "Restore".
  4. Select the iPhone2,1_4.3.1_8G4_Restore.ipsw file you downloaded.
  5. Wait for the restore to complete and for your iPhone 3GS to reboot.

Linux

  1. Install idevicerestore.
  2. Connect your iPhone 3GS 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 iPhone2,1_4.3.1_8G4_Restore.ipsw and press Enter.
  5. Wait for the restore to complete and for your iPhone 3GS to reboot.