Oh. Wow. The plus doesn't have bios flashback, only the Pro. That sucks!
If you bought the board or cpu locally usually stores will update it for you. If you didn't they'll probably still do it but might charge you for it. I don't know what/if CC charges. I think memex is $30.
Alternatively, you're going to have to find someone with a cpu, or order a kit from AMD but I've heard it takes months...
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