Has anyone heard from Makerx Yut123 David Yu lately.

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Looks like @YUTW123 posted 9 days ago

THE New Go-FOC DV4s

The buttons are not connected to the CAN BUS in any way. You can try shorting the buttons on the DV4s and setting always on on the vesc tool, this will keep the ESCs on. Then use the loop key to turn on both ESCs at the same time. Note that once the can wires are connected, the two ESCs must be connected in parallel to power up, otherwise they will kill the can chip.