I had the same issue with an Emerson TV I bought a while back. The remote had so many buttons, and without the manual, I had no clue how to adjust the advanced settings. After some searching, I came across
https://manuals.online/emerson — they’ve got a section for Emerson products, and I was able to download the PDF for my exact model. It explained everything clearly, and I finally got the setup right. Definitely worth checking there.