Yes, now I read the whole thread.
One more thing...the rescue boot would be how they say in the thread "a rescue loader for "bricked" cameras."?
I think they were talking about the Russian forum, not this particular update file.
Try to update firmware with that...and hope I don't brick the damn thing.
I don't have any personal experience with this, so I don't know. "kallek" in that thread reported success.