It sounds like you've already tried many of the standard troubleshooting steps. Here are some additional solutions to get your iPhone 12 recognized by your Windows 11 PC:
1. Check USB Connection:
- Ensure you're using an original Apple USB cable that supports both data transfer and charging.
- Try connecting to a different USB port on your PC. Avoid using USB hubs or adapters.
2. Trust This Computer:
- Unlock your iPhone and reconnect it to your PC.
- If prompted, tap Trust This Computer on your iPhone and enter your passcode.
3. Reset Location & Privacy Settings:
- On your iPhone, go to Settings ➡️ General ➡️ Transfer or Reset iPhone ➡️ Reset ➡️ Reset Location & Privacy.
- Reconnect your iPhone and tap Trust when prompted.
4. Update Apple Mobile Device USB Driver:
- Open Device Manager on your PC.
- Look for Apple Mobile Device USB Driver under Universal Serial Bus controllers or Portable Devices.
- If it's missing or has a warning icon, right-click and select Update Driver. Choose Search automatically for updated driver software.
5. Restart Apple Mobile Device Service:
- Press Windows + R, type `services.msc`, and press Enter.
- Locate Apple Mobile Device Service, right-click, and select Restart.
- Reconnect your iPhone.
6. Reinstall iTunes:
7. Check for Third-Party Software Conflicts:
- Disable any antivirus or firewall temporarily to see if they're blocking the connection.
8. Test on Another PC:
- Connect your iPhone to another computer to rule out hardware issues with your iPhone or cable.
If that does not help, then contact 👉 Official Apple Support OR you can always get your iPhone examined at the Apple Store 👉 Genius Bar Reservation and Apple Support Options or at an Authorized Service Center for further diagnosis and evaluation.
More detailed information on this subject here 👉 If your computer doesn't recognize your iPhone or iPad - Apple Support
Axel F.