Not related to Configurator, but my phone was just bricked by that iOS 12.1.2 update they pushed out with same version number but a different build.This may help someone. Updated my iPhone 7 Plus to iOS 12.1 via Apple Configurator on High Sierra, but got an error and the iPhone was bricked. Would not start up and hung with just the Apple logo and no progress bar. I followed all the support documentation on Apple Support, hard restart, use iTunes to update, then to recover, but nothing worked. Same hang. I then chatted with Apple Support and they told me to do all the same things I just did. No fix, of course. I scheduled an appointment with the Apple Store in 4 days (ouch!). Then, I thought more about it and figured it out myself. Since the update to iOS 12.1 from iOS 12.0.1 was done via Apple Configurator, when the iPhone was bricked, the instructions on Apple's site and from the advisor was to use iTunes to update or restore. That won't work. So I tried the recovery via Apple Configurator; it worked. I saw no mention of this on Apple Support or from the advisor. So I gave feedback to Apple on it.
Very bad integration, Apple. Was that a test case you tried? Guessing it wasn't, but it was important. It is not mentioned anywhere and the advisors don't seem to know about it. Why don't iTunes and Apple Configurator work better together? I'm a very unhappy customer dealing with such basic bugs. Clearly all use cases are not being considered and software is rushed out. Wishing even more for less features and more it-just-works.
Hope this does help someone who updates apps via Apple Configurator, but has to sync data via iTunes and gets offered functionality for backups and updating iOS that looks the same between them, but apparently isn't.
I had not plugged my phone into my computer for a month, since I was on the road. I decided to just back it up the other night when I saw the update that Apple pushed. I said "okay" and endured a long wait with hotel wifi. Eventually, brick city. I had to use that new method to force a shutdown, the volume up, volume down, power button method.
Had to eventually restore to factory defaults, as it would not let me update. Then had to spend the whole next morning getting stuff right. Still not sure if the wifi and cell rates are working normally, although I know that sounds odd, and it's probably because I'm on the road. Anyway, it was a real hassle. It wants to upgrade my other phone now. That will wait until I get home.