[WP76xx] No PCM signal

how about setting the AT!AVPIFACEPREF to F?

AT!ENTERCND=“A710”
AT!AVPIFACEPREF=F
AT!RESET

at!avcfg=5,1,0,1,0,0,0,0

OK
atd28245236;

OK

CONNECT
at!avsetprofile?

!AVSETPROFILE: 5,0,0,0,3,0

OK