iPhone error 14 is triggered when your iPhone reaches near maximum storage capacity. This can cause the phone to crash and get stuck on the Apple logo while updating. While there are other issues that can cause error 14, it’s often the result of an iPhone’s memory being too full.
Error 14 can mean that your device’s memory is full. Try restoring your device via iTunes instead of updating it. If it doesn’t work at first, press the Option Key (Mac) or Shift Key (Windows) and then select Restore.