This firmware runs smooth on MDKE9 with MD290, providing support of Russian language.

We tried to install this firmware on SOP-20 and got the bad luck - no response to pressing on any button of the panel. No Loc/Rem response on the turning on.
Tried to backup the firmware, uploading the previous firmware to SD-card in the panel, tried to remove the battery from panel, but the SOP-20 now runs the MDKE9 firmware from another folder of this archive, without any button response. Please, help us! :(