This is how one user did it.
Here is what I did using a Futaba 8FG:
Inside the A2 Assistant software I mapped the D4 (this translates to the F4 slot on receiver) channel to channel 5. On the 8FG I mapped channel 5 to throttle channel (T3), this way channel 3 and channel 5 are a clone of each other. I plugged each ESC into the F4 port and did my calibration.
After I was done I reset everything back to the way it was.
Here is what I did using a Futaba 8FG:
Inside the A2 Assistant software I mapped the D4 (this translates to the F4 slot on receiver) channel to channel 5. On the 8FG I mapped channel 5 to throttle channel (T3), this way channel 3 and channel 5 are a clone of each other. I plugged each ESC into the F4 port and did my calibration.
After I was done I reset everything back to the way it was.