Iphone 11 pro max crashed, stuck in reboot loop and won't restore from Itunes
Why?! My phone was tethered to a laptop via wifi, I received a text message, went to turn the volume down and then when I swiped up to enter my passcode the screen went black. 5 seconds later it came back on with the apple logo for 15 seconds then black again for 5 seconds. this process repeats with stopping unless I force quit it.
I attempted to restore it last night from itunes, it took ages to get to the restore screen, took ages to download and install the latest software update (was previously updated 3-4 weeks ago) then got stuck in a loop of 'attempting to retrieve data'. this repeated several times, each time taking about half an hour.
This morning it's back to crash and reboot
Help please!
iPhone 11 Pro Max, iOS 14