Q2698 and audio filter function

I use Q2698 with firmware 7.50A2 and ADL6.50A2. From document “AT Commands Interface Guide for
Firmware 7.50.A2 for AirPrime SL808xT and Q2698” I read at page 25 that audio filter command +WADF is not supported.
It’s a temporary situation due to 7.50A2 beta state or that command will never be supported from Q2698 ?
Is there any other way to program the internal audio filter ?
Thanks in advance to anyone who will help me


Tried on 7.52, doesnt work.