On TVs released in 2017 and later open Apps → search for "IPTV Smarters" or "Smart STB" (depending on availability in your region). Install the app, launch it and grant the requested permissions for media playback and network access.
Choose "Login with Xtream Codes API" if your provider gives you portal credentials, or "Load Your Playlist or File/URL" if you only have an M3U link. Enter the server URL, username/password (case sensitive) and press Login. The channels will sync in 1–2 minutes.
To download the EPG, find Settings → EPG URLs and paste the XMLTV link. Check the time zone (Menu → Device Preferences → Date & Time) - without this, the TV guide will be shifted. If the video does not start, turn off the power saving mode and make sure that the TV is connected to 5 GHz Wi‑Fi.