I got a few months ago an 159 with the blue and me not working.
I have a friend with the same car and i tried his unit, code 50510226 and it worked great, bluetooth was there, reading the mp3...
unfortunately he needs it and mine has the code 50505921
I have no idea if it's faulty or not or if the previous owner tried to get one but was the wrong one.
I have been trying to find a "226" but no luck.
I tested several blue&me units a few weekends back, I went to a alfa scrap yard and tried several but only 2 had the usb working but no bluetooth...
does anyone know if the part number is essential to match or as long as the unit was from a 159/brera/spider with all the same functions it should work?
i am getting to the point of getting both units (radio too).