question motherboard

So I've been wary of updating the bios on my board for a few years due to Asrock's own website saying I need a Matisse CPU to keep support for my Ryzen 5800X, but I also read of an EFI method but that seems more complicated to do. I'm on version 2.80 and my question is this: Do I TRULY need to...

Can i install a pcie 4.0 m.2 ssd with my current setup? My mobo is a Gigabyte A320M S2H v2, it has PCIe Gen 3x 4. My processor is a Ryzen 5 3400g which i think its second gen. Im confused because a bios update removed pcie 4 support for gen 3 Ryzen, but it dont know if i ever had pcie 4 support...