Think i found a solution using balbes150 files
"Fix for correct color to G12 (Amlogic S905X2 S922X)
For models based on g12 (s905x2 s922), which have a problem not the correct color ,
If you are starting the system from an SD card, you need to copy file u-boot.sd to u-boot.ext,
If you are starting the system from an USB, you need to copy file u-boot.usb to u-boot.ext
When installing in eMMC, you do not need to do anything with your hands, the installation script itself will perform the necessary system configuration and when running from eMMC, the system will work with the correct color.#"
I will try later when I will be at home.