How To Change The Advertising Channels For Mesh 3.10

Hi

When I use the SDK 15.2.0 & Mesh 3.10.

This light_switch example of   advertising bearer(Mesh Profile 3.3.1) default to using the channel 37.

So,I try to change the  advertising bearer channel to other(channel 38 or channel 39).And then,my find and add some code of about RF channels to only channel 39.But the LOG display error 6(mean unsupported data length or advertising parameter configuration).

Could you tell me how to change the advertising bearer to 39 channel?