Backup Error: Could not receive from mobilebackup2 (-4)
If you see this error in the Supervisor App during backup:
Error making backup. Check your device connection and pairing. ERROR: Could not receive from mobilebackup2 (-4)
This usually means the computer and the iPhone or iPad are not communicating properly for the backup.
What this means
This error is commonly caused by:
- The device not being properly paired with the computer
- The device being locked during backup
- A connection issue with the cable or USB port
- Using a cable that does not reliably support data transfer
- An interrupted Apple backup service connection
What to try
- Disconnect the device from the computer.
- Unlock the iPhone or iPad.
- Reconnect the device.
- Tap Trust This Computer if prompted.
- Keep the device unlocked and try the backup again.
If it still fails:
- Restart the iPhone or iPad
- Restart the computer
- Use an Apple OEM cable or certified data cable
- Try a different USB port
If the issue continues
Contact support with:
- Exact error message
- Device model
- iOS version