Thanks for that, and sorry for the mix-up - not sure how I missed something that basic (different major version IS pretty much the definituon of "the basics"...). Being said, I can pursue building myself on what i have now, and can share the result if its useful. And, shoud you decide to do a release for the RockPi 4B, and ya need a tester, I'd be happy to test or help however I can.