I was updating to beta 4 and suddenly it was hanging at the loading screen. Been waiting for 5 hours and my mac mini is hot as hell while there's no progress on the loading bar. Tried to restart and hold Cmd + R but still unable to restore back to Mojave ( I don't have time machine back up and usb drive mojave installer). Anything I should try or just bring to Apple Store? I don't have much data to lose so just want to get back to mojave.