That's not what I meant. Thing is if you buy one of those b550 from shop or amazon right now, they come with older bios that doesn't support the 5k series. Same thing when Intel launched 9k series to work on z370 with bios update, no boards with updated bios where in stock for a few months. I changed 4 z370 boards from amazon with no luck, till I gave up and bought the z390 (native support). There is only one option, you buy the board and hope to have someone with an older ryzen to borrow so you can update the bios. PS: None of the shops I buy from including amazon don't do bios upgrade, maybe something local which I don't have.