iphone 7 Plus stuck on logo screen

Follow these procedures.

Logo Bootloop or Stuck on apple logo

see the process below

If your iPhone is stuck on the Apple logo - Apple Support

or watch this video 

https://youtu.be/2CRilTPouRU?t=97

There is no guarantee you can save any data since your last backup if you need to use the Restore option.

gigigo ~ Does your iPhone 7 Plus still have its original 5½ year-old battery?

And, if your iPhone comes back to life, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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