Top Tips:
1. Backup your Zumo system files - You may accidentally delete a key file at some point (particularly if you try some of the following tips!) To do this: Connect your Zumo to your PC via USB cable. Using explorer, go to the first connected drive, labelled GARMIN. Here, you'll find a folder called Garmin, which is approximately 2GB. Copy the entire contents of the folder to somewhere safe. (I burnt mine onto DVD). Now, if you ever accidentally delete a key file, or have problems with the device crashing, you can do a comparison, and restore a missing file etc.