Nothing maybe… is your MacBook (Pro/Air) already running macOS 10. ![]() ![]() I am following the instruction video to the letter and everything seemed to work okay so far, but now I have to reformat my internal HD to APFS, using Disk Utility, I can’t do so because the “Convert to APFS” is greyed out… I downloaded the Catalina Patcher from and watched the instruction video. But in some cases, it's impossible to delete a specific partition, like an EFI partition, by using the Disk Management tool, because the 'Delete Volume' option is grayed out. I am trying to install macOS 10.15 Catalina on an unsupported MacBook Pro that I have lying around. Disk Management tool is the most common way to delete partitions on a Windows OS.
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