Cubot X9 notification Led

Hi all, I'm very glad to be members of this community.
I've buy a Cubot X9 and I enjoy this phone.
This smartphone have a notification led and the stock firmware
Can visualize only Red, Blue and Green color.
I would like to know how I can change the system file contents
To get more notification colors.
Someone can help me to modify this?
Thank you in advance.
Luigi.