Stuck in verifying software update 11.3.1
My iPhone 6 Plus has been stuck in verifying the update to 11.3.1 for two hours.
What is wrong with 11.3.1?
How can I get my phone back to work?
MacBook Pro with Retina display, macOS High Sierra (10.13.4), 512 Gb SSD, 16 Gb RAM,