you need to find a firmware that will work with your player now, updating is bad to do because all firmware are not the same
you need to take your player apart and then follow the thread here to find all the details for your player, then you MAY find a firmware
http://www.mympxplayer.org/s1-mp3-pl...om-vt8930.html
you can not change the keys at all, you now need to find a firmware that will work with your player