If you're having problems with the above, take the following steps:
- Make sure your iPhone's progress meter hasn't moved for at least one hour.
- If the progress bar hasn't moved in over an hour, connect your device to a computer and put it into recovery mode using the procedures below:
- iPhones 8 and up: press and hold the Volume Up button for a few seconds. Press and hold the Volume Down button for a few seconds. Hold down the Side button for a few seconds. Continue to keep the Side button down until the recovery mode screen appears.