Downgrading from Big Sur to Catalina - locked disc (?)

Greetings everyone,

A few days ago I downloaded Big Sur to give it a try. As it is still in Beta it is really buggy at some points and I could not work on my art works, that is why I decided to go back to Catalina and wait until Big Sur will release.

I used Option+Command+R to get in the recovery mode for Catalina version. I agreed to terms and when I needed to choose a disc - I could not do it because my disc was locked. How do I unlock that disc?
I have the same problem and I did not find a solution...
Hi. I'm not sure exact commands but I think you have to restart your Mac and then hold R+Command and it will tell you to reinstall MacOS to the latest version.
Downgrading from Big Sur to Catalina - locked disc (?)
 
 
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