Question: How to Correct an 805FC Database Error?

Answer: To correct this, You will need to remove the database file (Main_DB.TXT) and then restart the 805.  This will create a new file and start again:

Just connect the 805 via a USB cable to your PC.  Go into File Explorer, the 805 will show up as a USB device, click on it and you will see:

Delete the file MAIN_DB.TXT, shutdown the USB device (805), and start up the 805.