Resetting Computer Trust on iPhone and iPad

Introduction / Why This Is Needed

When connecting an iPhone or iPad to a computer (Mac or Windows PC), iOS prompts you to confirm "Trust This Computer?". This is an important security measure that prevents unauthorized access to your device's data. However, over time, trust settings can become corrupted due to OS updates, iTunes/Finder issues, or a faulty cable. As a result, the computer may no longer recognize the device, synchronization errors may appear, or the trust dialog may not show up.

This guide will help you completely reset the trust settings on iOS so you can re-authorize the computer and restore normal functionality with iTunes (Windows) or Finder (macOS). The process is safe and will not cause data loss.

Requirements / Preparation

Before you begin, ensure the following conditions are met:

• Your iPhone/iPad is running iOS 12 or newer.
• Your computer is running Windows 10/11 (with iTunes installed) or macOS 10.14 (Mojave) or newer (Finder supports synchronization).
• You have an original Apple cable or a certified Lightning/USB-C cable. Cheap or damaged cables often cause connection issues.
• Your device has sufficient battery charge (at least 20%).
• If your iPhone has a passcode, you must know it (it will be required when confirming trust).

Step-by-Step Instructions

Step 1: Prepare Your Device and Computer

Before resetting, ensure the environment is ready:

1. Update software:
   • On the computer: open iTunes (Windows) → Help > Check for Updates or in the App Store (macOS) → Updates.
   • On iPhone/iPad: Settings > General > Software Update. Install the latest iOS version.
2. Check the cable: connect the device to the computer. It should start charging. If it doesn't charge, replace the cable.
3. Launch iTunes/Finder: open the program, but do not attempt to sync yet.

Step 2: Reset Trust Settings on iOS

The most effective method is to reset network settings, which also clears the trust cache:

1. On your iPhone/iPad, open Settings.
2. Go to General.
3. Scroll down and select Transfer or Reset iPhone (or Reset on older iOS versions).
4. Tap Reset Network Settings.
5. Enter your device passcode if prompted.
6. Confirm Reset Network Settings.

⚠️ Important: This step will delete all saved Wi-Fi networks, passwords, Bluetooth settings, and VPN configurations. After the reset, you will need to reconnect to Wi-Fi.

The device will restart automatically. The process takes 1-2 minutes.

Step 3: Connect the Device and Confirm Trust

After the restart:

1. Using the cable, connect your iPhone/iPad to the computer.
2. A dialog should appear on the device's screen:

   Trust This Computer?
   [Trust] [Don't Trust]
   

3. Tap "Trust".
4. If your device has a passcode, enter it.
5. On the computer, the device should appear in the sidebar of iTunes/Finder (for example, under the iPhone icon).

Verification

Confirm that the reset was successful:

• iTunes (Windows) or Finder (macOS) recognizes the device and displays its name, capacity, and serial number.
• You can sync music, photos, or create a backup without errors.
• The trust dialog does not reappear on subsequent connections to the same computer (unless another reset occurs).

If the problem persists, proceed to the "Potential Issues" section.

Potential Issues

Issue: "Reset Network Settings" button is unavailable or reset didn't help

Solution:

• Ensure you have administrator privileges on the device (not a restricted account).
• Try resetting all settings (Settings > General > Transfer or Reset iPhone > Reset All Settings). This is a more drastic step but also resets trust. Caution: this method will erase all user preferences (icon layout, wallpaper, sounds) but will not delete data (photos, apps).
• If the problem is on the computer, reinstall iTunes (Windows) or update macOS (for Finder).

Issue: Device doesn't charge or computer doesn't recognize the cable

Solution:

• Test the cable with another device or port.
• On Windows, install Apple Mobile Device Support drivers (they usually come with iTunes but may require reinstallation).
• On Mac, try a different USB port (preferably directly on the computer, not through a hub).

Issue: "Trust?" prompt doesn't appear on iPhone after reset

Solution:

• Ensure iTunes/Finder is launched before connecting the device.
• Try a different computer to check if the issue is specific to one system.
• If the problem recurs, back up via iCloud, perform a device restore (Settings > General > Transfer or Reset iPhone > Erase All Content and Settings), and then restore from iCloud. This is a last resort but resolves deep system issues.

Issue: Error 0xE8000065 or similar in iTunes (Windows)

Solution:

• End all Apple processes in Task Manager (iTunes, Apple Mobile Device Service, Bonjour).
• Restart the computer and reconnect the device.
• If the error persists, check antivirus/firewall—temporarily disable them for testing.