MrG

So what can i do to fix my problem? 

I need to watch TV, miss it lol. It's been around a week  with no TV.

The message means the bootloader cannot communicate with the security chip.

if it worked before, and you are 100% sure it is an original, check whether the SIM card (inside the box) is still inserted properly, and its contacts are fine.

Well my SAT guy was the one who updated my dreambox before, but he charges too much. Also i think he sold me a clone and said it was German Original so i'm not doing any more business with him.

How can i check the SIM card? and contacts? I opened it up and could not reach the sim properly and don't wanna damage the machine more.

I'm afraid your DM800HDSE is a clone.....
For some reason it seems not to see the tuner...