Problem solved without Garmin costly help
Steps:
1. Load cure firmware as usual
2. switch on Nuvi, and tap left top corner, but after 0.5 - 1 secs later, than for pre-boot mode
3. wait for "Loading maps", then wait 5-7 secs and press power button
4. wait for copyright sign (C) and release power button
5. wait for language selector and release top left corner
6. IMMEDIATELY and very fast tap few times Ok button
7. Enjoy Nuvi
8. connect to PC, erase bad files and restart.
Many thanks to RTuERkaM from gps-forum Russia for its support and persistence.
P.S. You must experimentally select time in step 3. If selected time will be to short you don't see (C) - Nuvi will be switched Off.
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