Bluetooth Controller - Select (middle) button not working

Hey there,

I´m using a android box running CoreELEC 19.4 (last version so far), and everything is working, except the “select” button on my BT remote that came with the box. I´ve tried to use the keymap editor addon to “remap” the key, but didn´t work.
Reading other topics someone told to enable de debug and press the “select” button several times, and I got this doing that: http://ix.io/3Pfp
I´ve also tried to create a gen.xml and / or keymap.xml and placed them on kodi/userdata/keymaps/ with the following text inside, but didn´t work too:




Select



What Am I doing wrong?
Cheers!

Is it not possible to remap Bluetooth remote keys?