It’s nice to find kind people help you, i would say Thanks to washington, Ferret, and joy123.
The solution is as Ferret and joy123 said.
I used the dreamUP program.I connected my box to my pc by the null modem cable, and pressed connect so the dreamup found my Dbox, then pressed flash to chose the image (it was first time Gemini 4.4 Bl72 Patched) the upload to the box took about 1hour, then flashing took 2min.
When I was finished with my box and turned it on, the error message NO CA FOUND disappeared and began to boot but unfortunately it hung in the middle of the boot and would not continue to the end,i repeated 3 times, but still the same problem.I didn’t know why, but no matter.
So i thought to reflash with another image by the same way, I have searched and found the Nabilosat black hole v.0.12 Enigma: D2009.10.06.09.37.50-Oct 17 2009 PATCHED for clone DM, it took also 1hour to upload.
I was very happy to se my DM800 booting to the end and my box works again fine like dream. I think it’s better than Gemini 4.4. and no problem with the internal HDD as i had before with Gemini.
Good luck for all who have problem with there boxes.
And thanks again
/imasula