Identify the guide problem precisely
Choose one channel whose current programme you can recognise. Record whether its guide is empty or displays a different station’s schedule. A whole guide failing to load is a different task from correcting one channel, and a live event overrun can make an otherwise valid schedule appear temporarily inaccurate.
Use the exact feed where possible. Similar channel names can represent different countries, regions or time-shifted versions. A schedule that looks familiar is not necessarily the right one for the selected video.
Choose the intended loaded guide entry
The publisher documents right-clicking the channel, opening Map EPG channel, searching the loaded guide entries and saving the intended mapping. Use the guide identity shown in the results to distinguish similarly named entries. A guide that does not contain the station cannot be repaired by selecting an unrelated row.
Check the visible current programme after saving and inspect a later recognisable programme too. This guards against a coincidental match at one moment. Keep a private note of the previous mapping so a mistaken selection can be reversed cleanly.
Understand persistence and priority
IPTVnator stores the manual mapping for the channel rather than editing the original playlist file, and its guide says refresh or restart preserves that choice. Use Remove mapping to return to automatic matching when appropriate. Reimporting the same source repeatedly is therefore not a reliable way to investigate a persistent manual assignment.
Portal-supplied programme information and separately loaded guides can have their own priority settings. Record the source type and which data is expected to win. Do not assume an XMLTV file is required for every portal account just because it is used with an M3U list.
Use an offset only for a genuine uniform shift
If the correct schedules are consistently displaced, compare several channels and the device clock before applying the documented guide offset. The publisher describes it as a display-wide guide correction, with different implications from changing the provider’s stored times or catch-up requests.
For support, name the app version, source type, station/feed and example programme times. Remove authenticated guide addresses. A successful mapping corrects the guide association; it does not establish recording, catch-up entitlement or that the source video will always follow the published schedule.