Artem_dc, I am by no means trying to say that everything is bad and they are trying to deceive me here. I believe that the firmware is working.
But with my "unit" did not work.
The firmware rolled 4 times or more, in the hope that something crookedly rolled.
Power does not affect the firmware process in any way, since We are flashing a completely disconnected device (or am I wrong?).
Of course, after selecting a file, I did not remove any checkmarks.