Hi there!
Having bought a TBS6285 from eBay, I exchanged it with your side for a newer TBS6285 that supports DVB-T2 lite. The newer card can receive DVB-T2 lite signals successfully.
However, I am having problems getting DVB-C to work on my newer TBS6285 card. The older card used to support the DVB-C channels just fine.
So I hope your side look into possible coding errors in the drivers or something.