AUX4 AUX5 AUX6 Passthrough not working

Hi

When I enable AUX4, 5 & 6 passthrough it does not seem to work. AUX1 and AUX2 work if I enable them in QGroundControl under the AUX1 Passthrough and AUX2 Passthrough on the radio page.

I’ve edited the params file which has the following relevant entries:

|1|1|RC_MAP_AUX1|9|6|
|1|1|RC_MAP_AUX2|10|6|
|1|1|RC_MAP_AUX3|11|6|
|1|1|RC_MAP_AUX4|12|6|
|1|1|RC_MAP_AUX5|13|6|
|1|1|RC_MAP_AUX6|14|6|

In effect channels 9, 10 and 11 map successfully to AUX1 AUX2 and AUX3 however the rest don’t work. I’ve tested the channels from the RC end and they work on AUX1, AUX2 and AUX3.

What do I need to do to get AUX4-6 working as well?

Thanks in advance,

David.