Thanks for your help, unfortunatelu id doenst work on my case. The return button now doenst work at all (it used to open something like a progress bar on top).
But really thanks for the try
Can't you fix this with the Kodi Keymap addon?
Add-on:Keymap Editor - Official Kodi Wiki
I used it to map unused buttons (numbers 0-9) on my tiny Nexbox remote to functions in Kodi. I guess you can also use it to "learn" the command for the back button of your remote?