I doubt that any cross flashing would be possible, since the hardware layout
and the PBC are very different on BenQ DW1640 compared to BenQ DW1620.

However I believe the same PUH are used in both models, an the CPU should
also be almost the same, maybe a different revision though.

BenQ1620: Nexperia PNX 7860E
BenQ1640: Nexperia PNX 7860E/G/M1



如果1620能刷1640就太好啦XDXD...期待中
要不然只好買pioneer109啦...b