Here we are - 3600 which was still under manufacture 2-3 years ago are not get patched. Shame on you AMD, if it is true.
You need to be a root to exploit it, but if it get exploited any way to get rid of it is to throw MB to trash.
How do you trust that the flash was done properly if you did it from the compromised system? This would only work if you flashed it externally somehow without the system running.