Today finally we together with my friend successfully restored nuvi.
Fortunately the problem was not in Chinese FW loaded /yes, such a FW has been loaded on device as Caty suggested/.
The problem was a computer virus- unbelievable, don't you think?
After virus removal, 3790-3.60 loading passed smoothly. Then you know how the story goes.
My personal gratitude to all of you, who have guided me in this case.
I have learned a lot from you and hope some day to be in position to return the favour.
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