I went through the Russian posts and found this:
http://translate.googleusercontent.c...8S9BJs4W0Ba9WA
It seems to be a description of how to install the firmware.
It seems you need to root your nook before you do this.
I've been able to root my nook with the following method:
http://nookdevs.com/Rooting_B%26N_re...n_any_hardware
This one is the safest. You do need to be lightning fast with the commands to have it work. I suggest pre-typing the commands and copy-pasting them or cycling back to them with the up arrow key in the command prompt if you've typed them already.
I don't know if this process for installing the firmware works, I'm going to try it this evening and post about it later.