dvaz thank you!
If I will flash the US/SG 2.8 firmware (which mentioned by lolypop000 in the post 122) in EU 1310 device, does it not corrupt my Nuvi?
And what other new features could I obtain in my Nuvi? Do you know?

After some iteration I have flashed US/SG 2.8 firmware into my Nuvi1310T. It's works.
But I didn't find the Language Guide icon. In my previous SW ver. 5.10 I have it.
Does anybody knows how to return this feature? That I could use the Language Guide again.