1) First you need latest SD-ROBOTS firmware.
2) Go to settings/more settings/display and turn on force RGB
3) Display turns to pink - then change input on Tv to some other hdmi input - and then go back...........screen should be back normal.
This fixes pink screen problem until you turn off or reboot your box. Then you must repeat the process.
The setting for "force RGB" is stored in "/sys/devices/virtual/amhdmitx/amhdmitx0/rgb_mode" and should be 1.
I tried with ES File explorer to change some attributes to read only, but file is overwritten every time system boots.
Maybe Neomode could help to fix last problem, how to permanently store this setting.