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Install the Beta on my iMac, restart, then it got stucked with the progress bar at 90% and the spinning wheel stoped.It now can only boot in safe mode.There is no Recovery Mode available.There is no Internet Recovery as well.There is no access to Startup Manager too.All I get was a blank black screen. No Apple Logo nothing. I even tried holding the option key for more than 15 minutes.However, there must be something running in the background as the vent was still expelling hot air.So now there is no way to roll back to Mojave. Tough luck I guess.