I had an issue while trying to update to beta 9 on two identical hackintosh machines, basically whenever I tried to update the O.S. (from beta 8 to beta 9), I was getting this error "The volume can not be used because it is not snapshot booted".
Apparently this happens on some real macs too, and the solution can be found here https://developer.apple.com/forums/thread/653347
However this solution does not work on a hackintosh, and when I tried to enable "secure boot" from recovery, it just returned an error "Your firmware does not support secure boot"
(re-)installing mac os from recovery worked for me, and it installed the latest version 20A5384c. Don't know if anyone else had this issue, maybe this can help someone. I would also be interested to know if there is another solution to this issue, to be able to upgrade via the normal way.
I am using the latest opencore on an Asrock Z87 Board with an i7 CPU and an rx580 gpu
J