Thank god you‘re using a device meant for development then. I mean, you are? Right? Cause this is the developer beta 1 not meant for use on production / daily driver devices.In all these years I've never once had issues installing a beta until today. And of course it's that one time where I don't have a backup. Update wasn't finding iPhone. installed mobilepkg...then restarted computer....then it started to update / install then after verifying (I didn't have internet connection at that time) ...it failed after update phone firmware. now I see the connect / restore black screen. Which means I'm about to lose everything on my phone which is extremely unfortunate. Never had this happen to me before. I did a hard reset... but it did not boot up other than this black screen.