Upload the M3U file via the provider's portal or app settings.
Transfer the file to a USB drive (if using a physical MAG box) or prepare to upload it via your app's web portal. Download File tv_channels_mag00:1A:79:07:28:A8_...
This appears to be a request for a specific (often in M3U or cfg format) associated with a MAG box device ID ( Upload the M3U file via the provider's portal