Long press ( 2 sec) of the Mode button to enter the functions

Then short press of the Mode button to move from function to function

Function 1: Reversing:

When the A or B light is flashing, press the + / - button to set the servo CW and CCW direction function.

Function 2: End Points:

When A+B flashes alternately or C+D flashes alternately, press + / - button to set the throw of the servo. A+B is one end point, C+D is the other end point

Function3: Mode:

When the C lamp is flashing, it is V1 mode. (doors stay open), press the + / - button to switch to D (V2) mode
When the D lamp is flashing, it is V2 mode. (doors close gear down), press the + / - button to switch to C (V1) mode


Once in a mode, do something within about 5 seconds or you'll have to start over

And, yes, it is worthy of a sledgehammer