In the ES_input.cfg file you need to enter the keyboard inputs using their numeric value that the Pi assigns them. In SSH, type in the below and press enter, then scroll through the file to see the various numbers that are assigned:

nano /usr/include/linux/input.h

**edit** – I have attached a text file which shows the keyboard input part of that file above. probably easier to work from.

I use a keyboard / air mouse / remote combo and have mine setup to use the ‘power’ button on the remote to bring up the ES menu. That’s why it may look a little weird in the file on my build! In hindsight I should have probably changed it back to standard before I uploaded but never mind. It’s an easy fix.