program the BEC before you connect it to the ESC, there have been some issues with the castle link program getting confused if you try programming after you connnect
I haven't got it yet but trying to work out how to install it when I get it. By the looks of the photo the black and red wire go to battery and the ESC goes to Channel 1 (which is for steering) and BEC goes to Channe 2 for throttle which makes no sense, where is the steering throttle mean't to go??????
Note that the CastleLink is only intended for the CC-BEC and other (non-MM) controllers. The Mamba Max specifically is only programmable through the on-board USB port, not the 3-wire receiver terminal. I too ran into this issue recently and it’s clearly stated in the Castle Link software (great interface btw). Also you can program the CC-BEC while it’s installed/interfaced with your ESC. You simply have to “turn-off” the enable/disable toggle switch for the ESC and the CC-BEC will sync right up.