Welcome @samiam.
Wondering if this topic will help you with the black screen issue 
?
https://community.brave.com/t/trouble-launching-the-new-brave-core
- It’s a black or white screen - I have retried many times, have powered down and restarted the desktop since installing the new version.
Not sure about the
Hope someone helps you with this soon.
Otherwise, try searching the forum topics - another user may have there the answer to your query.
