I have a problem with the Nuvi 55 LM currently has old software 5,20 and HWID 1697, it won't start the system normaly, starts up and when you hit OK afther WARNING message it simply shuts down. If i leave and not the press OK hes OK and giv me cople massage its unreadable maps like when is unpatched and you put copy maps. And what is interesting I can go true menu normally but if I hit map on screen his shot down.
I wanted to connect to garmin express but the garmin express program doesn't recognize it. My computer recognizes it normally and I can access every folder.

Does anyone know what the problem is and how to at least update the software because it .It would help me if you installed a larger software, but via SD card, as when I'm doing a patch, if anyone has software 5.60, please leave a link. I would try abdeyt software and then patch and maps. I think I'm missing any maps and it shuts down.

It would also solve the problem if he managed to connect to garmin expres.
I try only different USB cables and USB ports,rebot garmin,recharge fuly,and my comp and USB ports working normally with others Garmin's.