No, you can't run Ryzen 5000 on your old AMD motherboard, but maybe that's a good thing
No Internet, you still cannot officially use AMD’s newest Ryzen 5000 desktop CPU in ancient motherboards—and now, you can’t seem to do it unofficially, either.
Those who own original X370, B350, and A320 boards had already known this as stated fact for some time. But the latest dust-up, covered by WCCFtech’s Hassan Mujtaba, arose when ASRock customers were caught passing around beta BIOSes that actually allowed Ryzen 5000 to go into older boards. Once AMD got wind of the underground dealings, the company put the kibosh on them.
Source: Computing – PC World