I've got a Hisense H9F TV and I use Channels on an Apple TV. The channel up and down buttons on the Hisense TV remote (ERF2A60) don't work. So I thought I'd assign 2 of the coloured CEC buttons to channel up and down in the Channels App settings however channel up and down are not available options to assign to the coloured buttons. I thought I read somewhere that those options should be available to be assigned to the coloured CEC buttons. Am I missing something or is this just not possible?