iPhone stuck reseting at Apple logo
my iPhone doesn't open but the apple icon keeps popping up for a few seconds and then there's a black screen and this repeats for days
[Re-Titled by Moderator]
iPhone 12 Pro Max
If the problem persists, visit an Apple Store or an Apple Authorized Reseller in your region for assistance to diagnose the problem.
And they could offer a possible solution.
You will first have to make an appointment due to the pandemic.
See: Contact Apple for support and service
Contact Apple for support and service - Apple Support