This version of the board uses dedicated MOSFETs for each motor. If one side fails to spin, check the connection cables or inspect the board for "blown" MOSFETs (which often look burnt or discoloured).
This guide is for educational purposes. Firmware flashing carries inherent risks. Ensure the firmware version matches your specific hardware revision (Board ID). Flashing incorrect firmware designed for a different chip architecture can permanently damage the device. ys-sxt-v4.2 b