Sainsmart 3018 pro cnc

Just got this machine a month ago and yes it works and will take candle commands ok but here is the question. I added limit switches but the program doesn't seems to acknowledge when there triggered. Their is no documentation as to the version of the board like "woodpecker 3.0" for ex. Anyway to figure this out. Does anyone have a same issue.

What model processor is on the main board? Is it Arduino compatible? Do you know what style of firmware it is using: Marlin or GRBL? Do you have a wiring diagram for the board or a way to know what Arduino pin each limit switches is connected to?

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