I was able to upgrade an existing BigSur Guest VM from my MacBook Pro host (Intel) using Desktop 16.5. At first, the upgrade failed and I was stuck in a black screen. I shut the VM down and made the following modification to the video setting (thanks @Gimbal
for posting this):
Find the VM file (.pvm) in your Parallels folder (usually in your User folder):
- Right-click on the .pvm file
- Choose "Show Package Contents"
- Open the "Config.pvs" file in TextEdit
- Locate the following strings (in my file, around line 454-456):
<Video VideoMemorySize_patch="1" dyn_lists="">
... change the "Type" value from 2 to 0 (zero), save and close the file, and close the Finder window to get out of Package Contents.
Once the upgrade completes and Parallels Tools are installed, then shut down the VM, and change the "Type" back to 2 from zero (so that video in the VM will perform properly).
Click to expand...