B450 and Ryzen 3000 support confirmed
B450 and Ryzen 3000 support confirmed
It likely was made recently when purchasing new, though certainty isn't guaranteed unless stated otherwise
As long as you're not buying it from some random guy off ebay, you can assume it's new. There's been huge demand for motherboards lately, so anything from any major retailer is for sure manufactured within the last few months.
Typically these boards come with Zen 2 built-in right now. If the packaging lists Ryzen 3000, that means it does support it. Most MSI models include Zen 2 by default. If your unit doesn’t have that feature, you might need to request an update from the seller or local shop. Are you sure this is the only option for your model? A version like the B450i Gaming Plus would likely offer better performance.