I'm very close to exchanging this MacBook because of this. Startup Security Utility -> Click “Allowed” for external USB volumes and changed security to Medium. Wait for the chimes and let go.) and reset SMC as well) Reset PRAM (Restart, hold down Command-Option-P-R during boot. Install the OS that originally came with my Mac (Shift + Option/Alt + Command R) Instead of the Windows logo I get the Apple logo, it boots into the MacOS Recovery mode, and displays the error “The version of macOS on the selected disk needs to be reinstalled”. HOWEVER this does not work on my new MacBook Pro. I have tried this on multiple different MacBooks and ever single time, it EFI boots into Windows 10 by first displaying the Windows logo. I used WintoUSB to install Windows 10 on my Sandisk Extreme SSD so I can EFI boot Windows 10 when I hold down “Option” during start up ( works works works). I have a new 2020 MacBook Pro (with the improved keyboard) and am running most recent version of Catalina.
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