If you have an older display and needed output_rgb, please use the following instead of the old interface:
echo 'rgb,8bit' > /sys/class/amhdmitx/amhdmitx0/attr
This no longer works. I am quite sure it worked after you first implemented it.
I did not use the box for some weeks, and updated to the version 8.0.2-testing8 today. My Philips got the "pink screen" almost immediatly.