Hi Neil, thank you for your support and help. I will read what you tell me, and I will try to carry out all the steps.
I cannot download the version 4.9 file from either of the two links. Can you provide me with the file in another way? In the first link it does not find anything saved with that url: and in the other, it no longer exists.

I have a doubt when it comes to flashing and no matter how much I have read it does not clarify it for me. When I upload a file to flash, do I have to modify the HWID before uploading it?

Regarding deleting the nonvol from the sd card, can it leave the nüvi completely dead?

Thank you very much for everything Neil.

Greetings;