Bluetooth A2dp problem !

hi ...
i have sony headset mdr-zx330bt .. i manage to make it connected ...
the problem is i can't change the profile to A2dp .. when using blueman-manager trying to to change the profile i got this error ..

https://image.ibb.co/hwY7Ha/Screensh...0_04_30_12.png

trying to change it with pavucontrol as i've read in debian official page is not working either , i manage to choose the profile , but when i exit and open it again i found nothing change

https://image.ibb.co/j2woOF/Screensh...0_04_34_16.png

any help here with detailed steps which i can follow ?

the problem is here i guess when i apply this command :

pacmd set-card-profile 4 a2dp_sink

i get this error !
Failed to set card profile to 'a2dp_sink'.

hoowaaaa , i managed to make it work after surfing the internet for two days ..

first of all you need to write down in terminal the following :

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nano /etc/bluetooth/audio.conf

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then you have to add this line :

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Enable=Gateway,Source,Socket

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now restart your bluetooth serivice by writing this in terminal :

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service bluetooth restart

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now pair and connect your bluetooth device using "bluetoothctl" or "blueman-manager", if your device already paired and connected , you don't need to pair it again after restarting the bluetooth service ...

now write down in terminal :

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pactl list cards short

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you should get something begins with "bluez_card.00" with the index number on the left for each card

and now with the final command :

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pactl set-card-profile [index_number] a2dp_sink

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congratulations now it's working ..
my os info : Linux kali 4.9.0-kali4-amd64 #1 SMP Debian 4.9.30-1kali1 (2017-06-06) x86_64 GNU/Linux
my Bluetooth module : module-bluez5-device.c

i hope you close this thread ... thanks