Microphone Gain Settings giving ERRORS on SL8082/SL8084

I upgraded few of my SL8082T/SL8084T modems from 7.52 to 7.54 (I first upgraded to 7.53.0 then 7.53.1 then 7.54.0). Everything works except the Microphone Gain.

On version 7.52 the microphone gain is really good. But after upgrading to 7.53 or 7.54 the microphone gain is really low. There is no way to change the again using AT+VGT or AT+WDGT. Those commands returns ERRORs … See below.

Please see the command output below… ANY HELP appreciated!!! Thank you.

ATI
Sierra Wireless
SL8084T Product
OK
ATI3
R7.54.0.A1.201603171313.SL8084T 1997208 031716 13:13
OK
ATI4
Q:0 V:1 S0:000 S2:043 S3:013 S4:010 S5:008
+CR:0 +CRC:0 +CMEE:0 +CBST:0,0,1
+SPEAKER:2 &C:1 &D:2 %C:0
+IPR:115200 +ICF:7,5 +IFC:2,2
OK
AT+VGT?
+VGT: 3
OK
AT+WDGT?
+WDGT: 1,64
OK
AT+VGT=?
+VGT: (0-22)
OK
AT+WDGT=?
+WDGT: 1,(0-255)
OK
AT+VGT=22
ERROR
AT+VGT=5
ERROR
AT+WDGT=1,100
ERROR
AT+WDGT=1,64
ERROR
AT+WDGT=1,255
ERROR
AT+WDGT=1,0
ERROR

at!custom?
!CUSTOM:
PUKPRMPT 0x01
MEPCODE 0x01
ISVOICEN 0x01
STKUIEN 0x02
PRLREGION 0x01
PCSCDISABLE 0x03
GPSENABLE 0x01
OATENABLE 0x01

OK

Hi Anilnair,
Even i have noticed this issue on normal SL808xt module firmwares… But with BTA firmware,this issue is not observed.
I will suggest you to check with your distributor in this case.

-Alex