Thank you, I solved the problem, I try to delete all channels and now the tv find all the new channels. I think that during a synchronising search the tv shows only new channels. I found the update software on the B&O site, there is a link on the Beovision 8 page. I downloaded it and put it on a USB pen drive, after you have to follow the update

Good evening, I'm italian and I have a Beovision 8-40, I updated the software of my tv with the update available on the Bang & Olufsen site. After the installation I tried to synchronize the TV channels in order to find new channels, but the tv was not able to find channels. Now with my tv I can see the same channels I saw before the update