The device record audio, even without internet.

Check the video for more info.

They look for any WiFi device you have, or your neighbours, HDMI connection(Those are 2 way connections BTW that can connect through devices that are plugged into your internet), or any other random laptop, phone, or neighbour's device that it can connect with. Just unplugging them from the internet does nothing. They keep recording and as soon as you have to plug in again or another route is available, Boom goes the dynamite.

i literally bought lg tv hours before their first driver fuckery came to light. im learning how to jailbreak my tv i hope its enough

Returning them.

Gamers Nexus is actively working on fixing this. It's a part of the investigation. Not just exposing the spying, but learning how to actively stop it on the devices. Stay tuned to the Gamers Nexus channels over the next few months as they release the investigation videos.

Open it up and disconnect or burn the modem and microphone.

The only good scanner is your frontal lobe. Most scanners are a scam prying on fear of the uneducated. Every smart device is a potential attack vector, and there are two class of entities that can use your device maliciously. Black hat hackers that put malware for residential proxy services or manufactures selling data to advertisers. There are ways to mitigate the risk like air-gapping, putting them on separate network, jailbreaking and buying dumb devices.