RCn_reversed not working

condition

  • cube black
  • arducopter 3.6.11 and (also 4.0 rc2)
  • herelink (ground and air unit)

I assembled copter above conditions.
However, the radio cali graph(pitch axis) is not suitable by pitch stick in HERELINK controller

Switching rc2_reserved form 0 to 1 is not effected.
Has the function been deleted from the Copter Firmware?

There have been articles saying the same problem before, but there has been no solution.

The herelink controller does not have functions to reverse a channel.
(But, normal operation in PX4 firmware)

Is there anyone who has a solution?

thanks.