Quick Summary
Error tvOS 1604 on iPhone during an update or restore typically indicates a hardware or software communication issue preventing the process from completing successfully. It often occurs during the verification or extraction of the software.
Common Causes
- Incompatible or Corrupted IPSW file: The IPSW file (the Apple operating system installation file) might be damaged or not compatible with the device. This can happen if the file wasn't completely downloaded or has been tampered with.
- Connectivity Issues: A weak or unstable internet connection can interrupt the downloading and verification process. Also, problems with the USB connection between the iPhone and computer can prevent the successful transfer of data.
- Outdated iTunes or Finder (macOS Catalina and later): Using an outdated version of iTunes or Finder can cause compatibility problems during the restore or update process. Apple frequently updates these programs to maintain support for new devices and iOS/tvOS versions.
- Hardware Issues: In rare cases, existing hardware problems within the iPhone can trigger error 1604 during an update or restore. For example, NAND flash memory issues can cause this error.
- Security Software Interference: Firewalls, antivirus software, or other security programs may interfere with the connection between the iPhone and Apple's servers, disrupting the restore or update process.
Step-by-Step Fixes
Method 1: Force Restart iPhone
For iPhone 8 or later (including iPhone SE 2nd gen and newer):
Step 1: Press and quickly release the Volume Up button.
Step 2: Press and quickly release the Volume Down button.
Step 3: Press and hold the Side button until the Apple logo appears, then release.
For iPhone 7 and iPhone 7 Plus:
Step 1: Press and hold both the Volume Down button and the Side button simultaneously.
Step 2: Continue holding both buttons until the Apple logo appears, then release.
For iPhone 6s and earlier (including iPhone SE 1st gen):
Step 1: Press and hold both the Home button and the Side (or Top) button simultaneously.
Step 2: Continue holding both buttons until the Apple logo appears, then release.
After the phone restarts, attempt the update/restore again.
Method 2: Update iTunes or Finder
For iTunes (Windows or macOS Mojave and earlier):
Step 1: Open iTunes.
Step 2: Go to Help > Check for Updates.
Step 3: Follow the on-screen instructions to install any available updates.
For Finder (macOS Catalina and later):
Step 1: Click the Apple menu in the top-left corner of your screen, then choose System Preferences.
Step 2: Click Software Update.
Step 3: If updates are available, click Update Now or Upgrade Now and follow the on screen prompts.
After updating, try the update/restore process again.
Method 3: Check USB Connection
Step 1: Use an original Apple USB cable if possible. Avoid using third-party or damaged cables.
Step 2: Try a different USB port on your computer. Some ports may provide more stable power or data transfer.
Step 3: Avoid using USB hubs or extension cables. Connect the iPhone directly to a USB port on the computer.
Step 4: Check for debris or damage in the iPhone's charging port and the USB port on your computer. Clean carefully.
After checking, attempt the update/restore again
Method 4: Temporarily Disable Security Software
Step 1: Temporarily disable any firewalls, antivirus programs, or other security software running on your computer.
Step 2: Try the update/restore process again
Step 3: If the restore completes successfully, re-enable your security software. If disabling security software doesn't fix the problem, keep it enabled and move to the next troubleshooting step.
Method 5: Download a Fresh IPSW File (Restore)
Step 1: Identify the correct IPSW file for your iPhone model and iOS version. Use websites like IPSW.me to download the proper file. Ensure it is the *Restore* file.
Step 2: In iTunes or Finder, hold down the Option key (Mac) or Shift key (Windows) while clicking "Restore iPhone".
Step 3: A file selection dialog will appear. Select the newly downloaded IPSW file.
Step 4: Follow the on-screen prompts to complete the restore process.
Warning: This will erase all data on your iPhone, so ensure you have a backup if possible. Only proceed with this method if other options have failed.