I bought a Russoind branded remote for $10 in hopes of it learning my preamp codes “head to head” . The first time I tried it, I had no luck. It did control my LG TV from its code library
When I tried to learn my preamp functions , I had trouble I finally got it to learn, I think maybe overhead lighting or the distance between them, or my technique???? Not sure but it learned everything after trying a third time …. Sometimes learning is your only recourse