rockchip an color space in matrix/nexus builds

hello, I'm using rk3328, and with old LE 9.2.6 output was full rgb by default,

In matrix and nexus builds output is limited ycbcr

is there a way to force full rgb in these LE versions? Maybe a SSH command exist?

thanks in advance

I've tried to use custom edid file with disabled ycbcr to switch to full rgb.

Could someone confirm that this will be solution in LE11 ? Should I try it?

I've tried it using this guide but without success yet, on last step, after adding

initrd=/edid.cpio drm.edid_firmware=edid/edid.bin video=HDMI-A-1:D

to extlinux.conf

device doesn't boot showing multiple errors. I'm not linux user, hard to understand what's wrong, so don't know should I even try it?