Included in Master fw. 2.9.X and above.
This fix is for remotes that do not send Guide or EPG over CEC, for example, some of the newer Samsung models (QLed).
To enable CEC combo keys goto Administration -> Routing Control
there you have the option to enable "Remote Control Combo Keys"
If you enable the "Remote Control Combo Keys" option, then an "Inputs" button will appear.
By clicking the inputs button you will be able to select on which inputs the combo keys are enabled.
Supported combo keys at this moment are
Green + Yellow will result in Guide key being send over CEC.