![]() Running diskutils list shows a 200MB+ partition on my Windows SDD names EFI and Alt-booting shows a disk named EFI Boot. Re-reading the posts here all over - there appears to be a clear distinction between setting up Windows in EFI mode and in BIOS legacy mode. Has the problem I am having always been there requiring third-party tools, or did I not do something right?Ĭlick to expand.Thanks! I will try that! So I was hoping this guide allowed just that. I do not need Catalina (and the whole Open Core solution), and this seemed like an elegant way to install Windows and use built-in tools to switch between two systems.ĮDIT: Just to clarify, the whole idea was to install a non-MacVidCards-flashed RX580 once there’s a reliable method of switching between macOS and Windows 10. I would very much appreciate any tips on fixing this. This also happens if I restart Windows - the same black screen and the error message. Selecting the EFI Boot disk loads Windows normally. The only way out of this is to hard reboot holding down the Alt/option key and then Select either macOS disk or the Windows disk named EFI Boot. ![]() The scary part is that it wouldn't even let me Command-R into Recovery mode after hard-restarting from there. Press any key to continue.'Īnd doesn't respond to keystrokes either. However, when I am in macOS and select BootCamp as the Startup Disk in System Preferences, it reboots into a black screen with a DOS-style error message When I am in Windows, I can click the Boot Camp icon, select Restart in macOS. Optical Bay SATA "A": High Sierra APFS SSD MacPro 5,1 with 3,33 GHz 6-Core Intel Xeon Installed latest on cMP5,1 using your guide. ![]() The goal was to install Windows and a non-apple-flashed Sapphire RX580 to play games.
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