Sat nav

My father has a Mitsubishi shogun 2003 and his navigation system has now stopped working and needs updating. Advice on how to do this without spending £100s of pounds would be very helpful.
I have no idea where to start.
Thank you.

Hi
I have a 2004 model with the 5.2 version disc, same as does anyone know how to update ????

Thanks

may i get an iso of your 5.2 disc? I would recoup you any expenses.