They may use one variant of one of the plugins for iptv and an update could break it, they have warned you but it is a stupid move on their part supplying a box you can't keep up to date. This is just one more reason not to buy a box pre-installed, If you can't keep it updated sooner or later it will become unsupported when the image makers move on to next release and things like epg etc will cease to function. You would need to know the way iptv is loaded on your box and your login/connection details backed up before trying to update, I wouldn't expect any help from supplier if you break it trying to update, worst case you will be reflashing box and buying a sub elsewhere.