I just started the upgrade process to iOs 11.4 Beta 4 on my iphone 7 plus
It has been stuck on white apple logo and thin white progress line for 4 hours now.
What is the process to get out of this stuck state?
Do I wait got the battery to die?
Do I hold down the power button until it reboots?
Will it brick my iphone 7+?
Any tips would be greatly apprcieated.