Ok, here is what I found: I was thinking the hfs+ driver was not needed as I'm running Catalina on apfs, but to boot recovery you need hfs driver. 1) VBoxHfs.efi (latest developer version compiled by me at the time of writing) is very slow, it took 3 minutes to boot the recovery, and it works only if in opencore there are ProvideCustomSlide=true and EnableSafeModeSlide=true (without these I have memory allocating 0xa00 type 2 error to boot into recovery). 2) Replacing VBoxHfs.efi
    • Thanks
    1