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The latest LONGER LK4 PRO or Alfawise U30 PRO Mainboard. (Please note that the power contactor has been upgrade for better one and we will provide the power cable as well)
The firmware download:
LK4 PRO: https://drive.google.com/open?id=1AlBe8k7FUY9VtomARSi0RPOkf0PvzUwW