Hi Hexor,
thanks for the valuable information and also thanks to all collaborators.
My BT board is a CC41-A.
It is soldered on top of another board that only has 4 pins (TX, RX, Vcc and Gnd).
After a couple of days researching in the internet, I was able make the board to answer AT commands thru my arduino.
However, no matter what i do, the board refuses to pair with my phone (sony Z Ultra) nor my 2nd gen nexus 7 tablet.
Then i found this thread !!
By flashing a firmware there is a small chance that i may forever brick the BT board, so I just want to be sure that these CC41-A are actually useless with the factory firmware.
Will it only work by replacing the firmware ? Is this the only way right ?
Thanks a lot.