XS3868 Bluetooth Audio Sampling Rate

I manage to get my XS3868 Bluetooth Audio Module working. The AT Commands via the Arduino built-in USB to UART work too. But I would like to change my audio sampling rate to a higher rate (44.1khz to 48khz). After looking at the datasheet, I notice that there is no at command that could change the audio sampling rate and yet at page 7 of the datasheet there is a way to somehow set the sampling rate between AA1(48kHz) and AA8(16kHz). I've tried typing AT#AA1 but it doesn't work. Help!! :confused:

Datasheet:

f.JPG

The sample rate can only be changed by the specific file you are trying to play. The bluetooth module automatically updates the "sample rate" when you play a file with a different sample rate.

Why would you want to change it by serial in the first place?