Dude, pretty much all boards were updated after Alder Lake came out. Regardless of BIOS ROM size. Even the dinkiest A320's support not only Zen 3 but the 3D chips nowadays, ergo, AMD was lying. It's such a simple statement of fact, such was the lie that you can pop your 5700X3D or 5900XT (the last chips they released just last year) onto almost any if not every A320 at this point and it will work. It was never a true technical limitation, otherwise that would have held up to this day.
Please, just for once, lay off the gaslighting... I can't take it anymore. GamersNexus doesn't fabricate statements, those in the video I sent came from AMD themselves. It is an old video and the information in it is no longer relevant, that doesn't change that for a year, that information remained true, until market conditions forced their hand, ergo, AMD is driven by business interests alone.
I clearly stated which board I had in my post, B550-E, it is a ROG Strix board and one that is regarded as one of the better socket AM4 boards overall. And again, the AGESA issues were fixed over time, which makes the issues irrelevant... today. Not at the time, though. And AGESA is very much an AMD thing, so it would have happened regardless of motherboard model or make.
Really, I openly admit that I have not a shred of love for Radeon, but I don't share the same animosity towards Ryzen. They are great chips (with a few exceptions, but even those are just inefficient, not bad, like the halved cache Ryzen 5's that lose tons of performance, or the imbalanced 7900X3D that can't make full use of its resources as well as it should), and as long as there is reasonable pressure from market conditions, they tend to keep that in pretty good shape too. Bugs are fixed in what I personally consider to be reasonable time, and despite the rocky starts (first generations on a platform having problems, eh, debatable, I don't think it's the end of the world, at least not now), they tend to treat their owners well.