Updating Bluetooth drivers on MEX-N5200BT car audio.

[Stephenjames75]

Hi, 

Please could you help me? I am having trouble updating the Bluetooth drivers on the MEX-N5200BT car audio system. I have followed the instructions on the Sony website using a 16GB memory stick. I am getting a 'update error' message. Can anyone shed some light on this problem? Would anyone know how to use and open .U88 files? WinZip seems to draw a blank. 

Many thanks.