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Yes,VMware has a free (as in beer) windows tool to update (downgrading is not possible) the microcode.

• duskwuff 7y ago
  > downgrading is not possible Sure it is. I've done it myself. Microcode is stored in volatile memory on the CPU. Updates are applied on boot, every boot. "Downgrading" is as simple as not applying updates, or applying an older update.
  • shawnz 7y ago
    Perhaps they meant that downgrading is not possible without a reboot.
    • quintushoratius 7y ago
      Loading microcode on a CPU (without patching the firmware) takes effect immediately. The update is lost immediately upon reboot and must be reapplied each time.
      • shawnz 7y ago
        Right, but can you load an older microcode after a newer microcode has already been loaded, without rebooting?