Grundig TV 32 GCH 6730B Connectivity Woes - Error Code 6

My Grundig TV 32 GCH 6730B does not connect to the internet, and whenever I try, I get error code 6. I contacted customer service, but it's clear they are unable to resolve the issue—they simply advised me to turn the TV off and on or to unplug and plug it back in. I followed their instructions several times, but nothing changed. It’s disappointing that such a well-known brand fails to offer a reliable fix for a basic feature like internet connectivity. I’ve seen many people report the same problem on various websites, but as far as I can tell, no solution has been provided yet.