Iphone 8 plus
My iPhone keeps starting up with the apple logo then the apple logo disappears and my phone just shuts off again and it keeps doing this oj repeats while it charges. What do I do?
iPhone 8 Plus, iOS 11
Try this, but I think the phone may be toast.
see the process below. Work all through it.
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
There is no guarantee you can save any data since your last backup