Hello, welcome to our forum.

The most important thing to know, is that your box has inside a sim card (like on mobile phones). That sim card is in control of the software, and only compatible software with the sim card will work on the box, otherwise it will give the NO CA ERROR you had.

First you need to open the box, and check the sim inside and compare with the sims below, once you know which sim it is, then you will be able to flash the correct image, and you will have the Tuner working. This is not a hardware problem, but a security software TPM/Check that disallow the tuner if the software is wrong.

Which Sim : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=2679

I can confirm your sim is an original, so only original images will work with your box.

This done, to fix the NO CA ERROR, you have the procedure with a RJ45+USB Cable on link below to recover your box.

Recover : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=15214

For example for the original sim, only SSL84 images for Original box will work, and never the SSL84a/SSL84b/SSL84c/SSL84d that are for Sim from disappeared Team Sim2, or the SSL84F from Ferrari Team, and the SSL84J from Japhar Team (This forum is Japhar Team support).

So for your original sim, only images on section below will work,

DM800HDse v1 Original images : http://www.ourdreambox.com/ubbthreads.php?ubb=postlist&Board=105&page=1

TS