I got an R50 years ago, and have now switched my TV to the TCL S405. Apparently the R50 does not have codes for it. I've been trying to re-learn how to set up this remote, searching and reading. The only thing I could find was this post here:
"closing this thread out, the TCL code set in URC library for model "55US57" worked perfectly for this Roku TV model."

I'm unable to find this "code library", or how to input the code. could anyone help me out?