The phone also doesn't start in flasher mode:
I start flasher on my PC, it says "Suitable USB interface (bootloader/phonet) not found, waiting..."
Then I connect the phone and... it just turns on like it does not connected to PC or it keeps rebooting or it shows "charging" icon.
Finally it shows "Device not working properly" because of "too many reboots" message and advice me to update software or contact Nokia Care...
Flasher still on "Suitable USB interface (bootloader/phonet) not found, waiting..." stage.