fix reboot looping

See this support document here, including contacting Apple Support if that does not help. If your iPhone is stuck on the Apple logo - Apple Support

Tallie36 Said:

"fix reboot looping: I can't fix my Iphone 8Plus which in in a reboot looping showing the apple logo on and off the whole time. Press Volume up button-press Volume down button-press side button doesn't work!: Any other suggestions?"

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Perform as Instructed here: How to Fix an iPhone in a Boot Loop - User Tip