Is there any chance that BenQ will release firmware to upgrade the DW1620 to the DW1640 like they did for the DW1610 to the DW1620?
there was never a FW to update the 1610 to the 1620.
He's probably thinking of the flashing of OEM drives to Pro f/w.
I guess he meant the official DW1600 to DW1620 update.
You couldn't update the 1620 to a 1640 anyway because the chipsets that drive them are different.