SamyGO

What I did:
read post: viewtopic.php?t=5177

enter service menu by: info menu mute power
advanced
0000
Option
MRT option
BT support ON
return return retun
(i did no update in svc menu)
power off

power on tv
menu - system - device manager -Keyboard
(Menu entry: bluetooth keyboard is greyed)
Power off tv
attach USB Bluetooth dongle
(mine is: 0a5c:2101 Broadcom Corp. Bluetooth Controller)
power on
menu - system - device manager -Keyboard
add bluetooth keyboard
(bt keyboard LOGILINK ID 0052 distance 0.5m from bt dongle)
start pairing by keyboard - found)
(select with TV remote, enter) there comes a popup (enter code xyzxyz for pairing)
i entered the 6digit code
and Keyboard worked
(BT name is: "Bluetooth Keyboard")
(tested browser and F1-key (=red button))
channel switching 1,2,3,4,..... works

now the kicker: attatched an USB-4x-Switch, still working
hurray
End of story.

P.S. still no a2dp support, I beg apt-x codec support is nessesary
Everything tested with usb-rs232 disabled and both usb ports(hdd and cam Port)

P.S. still no a2dp support, I beg apt-x codec support is nessesary

Did you try to enter service menu > "Option" > "Engineer Option" and switch "BT_AUDIO_ON_OFF" to "ON"?

Thank for that hint, but i didn't need to
because BT_AUDIO_ON_OFF" was turned "ON" on my menu.

Np.
Turned on by the factory, or you turn it on?

I dont remember. I think it was factory set. But anyway, seems that it does no harm to turn it on.

What's the problem? The A2DP source is connected, but no sound is coming? Or you can not connect A2DP source?

No device is available. Tried a2dp headset, and a2dp car loudspeaker hama mb150. Both cant be found in device manager
on samsung tv. You can read my post viewtopic.php?f=67&t=6898 in F series brainstorm.
or viewtopic.php?f=52&t=5640&p=41747 in eseries support. hsp profile doesent work either.
(Connection to bluetooth keyboard is working. So bluetooth is ok)