My osmc only works in 16bit mode but it’s realy ugly. I’ve tried this method How do I Change Colour Depth - Raspberry Pi Forums
But it’s not working.
How do you determine that?
If you run the fbset command from command line it will tells you. But you can see in the colour shades the difference between two shadess is so low you can tell where one is ended.
If i run the “fbset -depth 24” and after “fbset” it says 24 bit if i restart it it tells again 16 bit.
i think the default fbset output is 32.
Can you please post the output of fbset?
the output was previously:
mode “1x1”
geometry 1 1 1 1 16
timings 0 0 0 0 0 0 0
rgba 5/11,6/5,5/0,0/16
endmode
now I’ve restarted it multiple times and it says
mode “1x1”
geometry 1 1 1 1 24
timings 0 0 0 0 0 0 0
rgba 8/16,8/8,8/0,0/24
endmode
but as I can see something is not ok 
and the screen still looks ugly.
I’ve reinstalled the whole osmc (was about time) and it’s now:
mode “1x1”
geometry 1 1 1 1 32
timings 0 0 0 0 0 0 0
rgba 8/16,8/8,8/0,8/24
endmode