I've recently bought a CC Sidewinder for my crawler. I'm using it with an external CC BEC to handle the servos for my brushed motor 55T

To program it, I did the following:

. Pulled the trigger on maximum (100 EPA) throttle and turned on the ESC, the light turned flashing green.
. When the light turned flashing red, I pushed the trigger forward at brake position (100 EPA)
. When flashing yellow, I relieved it to neutral, then it turned solid yellow.

The crawler works fine with moving forward and steering, but there is NO reverse.

What am I doing wrong? I'm using a Futaba 3PM 2.4ghz radio system.

Thanks in advance.