How do I perform a hard reset on the iPhone 8 or iPhone 8 Plus?
Restarting or shutting down your iPhone 8 is a little more difficult than just holding down the sleep/wake and Home button. Apple changed the way you restart your device with the iPhone 7 and has now changed it again with the iPhone 8. Here's how to force restart/perform a hard reset or showdown your iPhone and iPhone 8 Plus:
Press and release the Volume Up button then press and release the Volume Down button. Press and hold the Side button for ten seconds until the Apple logo appears.
Do all these steps quickly to restart your phone.