Before you do ANY software mods, backup your system. Basically EVERYTHING on flashdrive and call it stock backup.
If you are not running the latest version 3.01, then consider purchasing and applying that update. It is faster and almost all the mods posted here are for version 3. If you apply a ver 3 mod to a unit running ver 2, it will not work and it will be hard to recover if you do not have a backup of the files.
When you do apply a mod - remember to delete everything except for the favorites.dat file (if it exists) in the USER\USERDATA\IGO\SAVE This will delete all your user preference settings as they applied to your last build. If you have any settings in their that the new build (mod) does not understand, it will give you trouble. (as in not boot)
Follow all instructions very carefully. The better mods written by the more skilled, include directions. Avoid any other mod In my experience IDT / Boris / GPSSoftware all know what they are doing - there may be others but I personally have not tried their mods yet. Others may post other trusted mods