Garmin Nuvi 250W debug/service codes

[ShortCircuit]

Hi there reader,
I bought this nuvi navigator off my local thrift store for 10€
(mostly for hacking and to mess around).
Now, here's the thing...
I searched through this forum and others to find those codes,
but I found nothing.
So, anyone there has some debug/service codes/combinations to mess around the device?
Any help is apreciated.
NOTE: My nuvi is running software version 7.80 Europe.

 

[Nuvi-Nebie]

Figures 1, 2 and 3 will probaly apply to your Nuvi250W, :-
https://www.gps-forums.com/threads/garmin-secret-menus.46595/