@SAVVAS
GarminDevice.xml recreates itself everytime you restart nuvi, you can edit it ,but it will return to its original version when you restart. You can even delete it and nuvi will rebuild it like it was.

Converted 37xx to 34xx shows 37xx in Settings/about and in starting screen. There is a quite complicated way to make it show 34xx, but it's completely useless.

GarminDevice.xml is not to share on public forums because it contains personal maps codes and Nuvi ID. If published someone could clone your nuvi.