No, this firmware is working well. I meant that it was more suitable for players who have 6 or more buttons - a separate "forward / back" and "vol + / vol-". The picture I showed that I had only 5 buttons and the bottom two buttons at once served two purposes - "forward / back", but when you click "Volume", the same buttons control the volume.
So I wanted to use the standard firmware -
http://mympxplayer.org/firmware-pma-300010-df385.html - but it can not be installed. Can I fix this firmware? Or find a firmware for the player with 5 buttons?
Thank you for your answers!