The vehicle could go forward and brake but couldn't reverse.
Possible Causes1: Didn't calibrate the throttle range properly.
Solution1: Recalibrate the throttle range.
Possible Causes2: Didn't set the "running mode" to "FWD/REV with Brake".
Solution2: Set the "running mode" to "FWD/REV with Brake" or factory reset the ESC.
Possible Causes3: The ESC was damaged.
Solution3: Return the ESC to its manufacturer for repair.
Прямо в faq ответ есть.