However, I still can't make the 'return' button on air remote work as 'RETURN' button (aka 'Esc' key) on the fire tv remote.
The 'RETURN' button on the air remote is 'right-click' command and and could find away for the Fire TV to receive that command so that I could remap it.
I have the MX2 Gbox and the box does receive the 'right click' as 'return' command, but I don't know how they did it. I tried to copy the files in the /system/usr/keylayout and /system/usr/keychars from the Gbox to the Fire TV and ended up bricking the Fire TV. Thanks god there is a tutorial to debrick it...
Anybody knows a way to do this properly?