Make sure to try these steps several times. Sometimes it takes up to 5 or 6 tries. If still no go then try using a program like ReiBoot: https://goo.gl/2QfsbL

If you having issues on your iPhone 8 or 8 Plus such as a black screen, lagginess, frozen, stuck on apple logo, unresponsiveness, etc then the first thing to try is a force restart. Note that this can happen to all phones including Android phones as well but each phone has a different key combo to do a force restart.

To force restart on iPhone 8 or 8 Plus (also iPhone X) you want do a 3 key combo. Press the up volume button, then the down volume button, then press and hold the power button until you see the apple logo. You may have to try this method a few times. Hope this helps.

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