Hello Tommy!
Did you achieve this through retroarch on linux, or through a lakka-self-compited-img...?
It's been almost 2 years, lol, so I don't know if you made any progress but in any case, would you be willing to share whatever image you have working best?
I am working with the k5.15 and it's been great for many things. Retroarch doesn't seem to be one of them, tho. Maybe I need to tweak it a lot and should not expect it to work great at install, tho...
Thanks!