Reception issue with channel 6 Freebox

re
restart the box but also the TV decoder (unplug it, wait 30 seconds, plug it back in) to perform the latest software updates
if that doesn't resolve the issue, try to see if you can find channel 6 on another channel much farther down the list; and if not, do another scan.

otherwise, I don't know! but I'm not sure it's your equipment that's the problem

can you try just with TNT if you have the option for both reception modes?
if yes, check especially if the other channels on the same multiplex are present, namely W9, NT1, Paris Première, and ARTE HD for R4, or TF1 HD, France 2 HD, and M6 HD for R5

in ADSL
changing the Freebox may resolve the issue, as the new boxes are more efficient, particularly with the tuner (MPEG 4); for Free, the V6 (Revolution) is the best in my opinion, better than the Mini 4K which often gets complaints about many issues with its remote control. I don't know about the last Delta given the price... personally, I’m sticking with my V6.

Hello
which region do you live in

I live in Yvelines.

Thank you, it is the best solution.