You can't replace them.
If your provider didn't change the domain, just the streaming links, then you will get an update (if you linked your m3u) and you will have to import all the channels again as they are completely new channels for the system.
Alternatively you can download the m3u file from the site, change the links in a text editor and import that m3u file again and link it to your original file on the provider's server.
If your provider didn't change the domain, just the streaming links, then you will get an update (if you linked your m3u) and you will have to import all the channels again as they are completely new channels for the system.
Alternatively you can download the m3u file from the site, change the links in a text editor and import that m3u file again and link it to your original file on the provider's server.