I recently updated raster and vector charts on my NN3D. Operating with raster charts worked fine. Then I added AIS to the system. when I switched to vector chart display the chart flashed then system re-booted. When the reboot finishes and I hit roto key to accept warning same thing happens. If I time it correctly, I can get to menu before it crashes. I tried to re-install the vector charts but get message saying 'file not found' when it reads my SD card. AIS does not appear to be the problem as I turned off power to AIS and problem persists. Are there any options to resolve without turning to a technician?