Hi!
I have solved the problem.
I have download the 470 (latest) firmware version from [Only registered and activated users can see links. ] and I have modified all these extensions: .GCD .gpx .gpi .zip .vpm .img .jpg .srd .srx .asr .srf and .gcd
And I have also modified these hexa values (as ddabcd277 said in that post):

Find and Replace everywhere in the .rgn (boot+fw_main):
30 00 3A 00 2F to 00 00 3A 00 2F
31 00 3A 00 2F to 00 00 3A 00 2F
30 3A 2F to 00 3A 2F
31 3A 2F to 00 3A 2F

Since I have installed the cure, the GPS works fine!!
Then, I have delete all the files that I created yesterday and installed the complete version (without the cure). Now works fine

ddabcd277, I think that the firmwares are the same as in the 3760T model, but if you want anything, please tell me

Thanks to all!