Ron I did everything as described by ayan at http://avic411.com/index.php?/topic/82391-avic-f10f20f920f9210f9220bt-evrope-maps-update/page-3. However, after the whole operation to point. 5 I did not turn off the radio as I wrote from point. 6 and there is a message installer files not found. Is SD/USB still in device