I have a legitimate V4 which I've been asked to copy a few times, I won't do it. Lots of hard work went into it and the previous version is graciously available for free. As pointed out above.
i was not very clear,
the board is designed for a 40pin 128k chip,
just because the 512k chip is also 40pin does not mean the board has all the pins connected to the right signal for it.
the original chip does not use pins 38 or 39 - make sure the socket has them connected to something - ideally pin40