Hi, My JM4 suddenly stopped working. When I hit the record foot switch nothing happens. So I decided to try to update the firmware before trying to replace the foot witch. Formatted the 2gb SD card with my PC (FAT) then formatted the SD card in the JM4. Selected "save all recordings to SD card". It now reads "Line 6" for the SD card name when inserted into the PC, but no data is found. What am I missing here? Also, where can I find a foot switch for this unit? Thanks!