Hp pavilion dv7-4152si subwoofer not working after updating bios

hi there, 
i have recently updated my bios and since then i do not have any sound coming from my subwoofer.  
when i go into my bass management settings, it tells me that my subwoofer is not present.  
i tried to update the driver, but after that i could hear no sound whatsoever, so i rolled back the drivers.  
any help would be appreciated, thanks!  

Hi
I'm experiencing the same issue with my dv7-4152si. Have you find a way to resolve this issue?
I had a look in my beats but can't find a subwoofer setting at all.
Kind regards
Louis

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