I have a Blue Angel (spv m2000) that was working fine until for some reason the SD card stopped showing up in File Explorer. I thought the registry may have become corrupt so I upgraded the OS from 6.1 to WM 6.5 which I have done successfully and everything works fine accept the SD card is still nowhere to be found. I have searched every where for a solution and this is a last resort. If the registry or some other file was corrupt, should the OS upgrade have fixed it? If not, what could be the problem.