Need help and advise for my w850 firmware or custom pack bout head set

Need help and advise for my w850 firmware or custom pack.
the problem of my phone.
i connect to my bluetooth head set
i can't hear it to my head set when i play my walkman player.
but calls i can hear.
i'm using firmware:
W850_R1KG001_FS_APAC_RED52.fbn
W850_R1KG001_MAIN_GENERIC_CY_RED52.mbn

what is better to use software when flashing my phone?
XS or setool2lite

please need help...
thanks and god bless...

You must use Stereo Bluetooth Headset to listen music from W850.
With Mono Bluetooth Headset you can receive/make calls, but cann't listen music from phone!

thanks for reply...
my headset bluetooth is stereo.
but i tried other phone works fiine.
what about patch?
please what do use firmware and custom pack of my w850?
cause other themes my phone lag. ehehehe
thanks again.
i need firmware and custom pack better. thanks...

XS++ 3.1 is good soft for your phone