Je voudrais savoir si il y a moyen de faire fonctionner ma boite multimédia (buzz 4900 ou un autre) sans internet

you can play stuff off an external drive or play saved recordings/downloads

The integrated BuzzTV software is designed for IPTV which by nature would need internet connection.  Except as du mentioned above, you can play saved recording/downloads.

Guess you can also install a 3rd party software like Plex, Jellyfin or even just use VLC and browse a local NAS or other local storage (USB or network) to play local media.

 

OK mais le probleme c est quand je le connecte au démarage il cherche une sans arret conection internet et il ne s ouvre pas completement

Is this the INITIAL power up ?  I am pretty sure the FIRST power up you do need to connect it to the internet for it to download it's latest updates and install some remote apps.  But after the first boot, it does not "NEED" the network.

 

Hit the home button 2 or 3 times It will then clear that search