If by 'reboot' you mean to wipe it completely clean then do the following. But if you want to save your waypoints and tracks you should do that first. You can do that to the SD card in the unit or serially to your computer using any number of free or costly software. It'a also a good idea to remove the SD card while wiping the unit, it can do a format of that card.
To wipe it clean, press [menu], then arrow down and press [setup], then arrow down and press [clear memory], then select [all] and press enter. It will ask you if you really want to do that, if you do then slelect [yes] and press that.
Now your GPS is fresh, to whatever satellite configuration its firmware knew about, probably 2004, so you have to set the date, set your approximate location and have the GPS ON for a minimum of 12.5 minutes with as good a clear view of the sky as possible, and do not move the GPS around while it's trying to re-acquire the satellite almanac.
Others will say that this will make your unit no longer be able to receive WAAS augmentation, they are right, but I spent all last year figuring out how to fix that, check
http://ray.jerome.jobs.googlepages.com/MagellanWAASfix which at least 100 people I know of have used so far.
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