The 10.15.2 install volume should now boot and install the update. (You save it off because we'll need it again.) * Rename boot.efi in the install volume to _boot_efi (or something) and copy the 10.15.1 boot.efi you saved off into its place. If sip is not already turned off, turn it off now, or you'll be hosed. At this point, the only different one is the boot.efi in the install volume. All of the boot.efis - from the Recovery Volume, your CATALINA, etc., should be the same. * Boot into recovery mode, and copy one of the 10.15.1 boot.efi files to a safe place, such as your home directory. When the virtual machine restarts, and the install volume tries to boot, you get a black screen. * Install the 10.15.2 update as you normally would. I can confirm that the workaround of using the 10.15.1 boot.efi with VB 6.1.0 allows the 10.15.2 update to be installed and OS X to boot afterwards.
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