Yeah the image file on the flash chip is not compatible with the boot loader, or corrupted due the use of w7 or higher.
At least, assuming that the sim card in it is at least sim 2.10 because the #84 boot loader is only for this type of sim card.

However, suppose it has the sim 2.10 and so this boot loader #84 is suitable for the simcard, it needs only the dm800se Sunray SR4 Sim2.10 (openpli) image file (note that if you use the Nc3 Japhar sim card you need to use the ssl84J boot loader and image files are always named with Japhar and in this case for the dm800se).

However, most important thing to fix this issue it to use a windows XP system.
Windows 7 or higher will most likely not work, you can only upload the boot loader, a image file upload will not work.

You can only upload a image file with win7 or higher if the box is working.
And the best is to do it with the browser.

And so, use a computer with windows XP and fix the no ca found with optiflasher.
After that, upload a image file, one that is suitable for your sim card and type of receiver.
Or upload the image files with dreamup, or other upload software.

But the main thing is that you probably will not succeed to fix this with a windows 7 system, you will only succeed with a windows XP system.

So, maybe you are be able to ask an friend or family to use their Wxp system computer or laptop, to fix your receiver.
Because the success rate is greater than with any other system.

---- Working box with sim2.10, changing to the Nc3 japhar card ---

When the box is working with the Sim2.10 sim card.
Upload with Japhar flasher the ssl84J bootloader, do no reset, upload the Japhar dm800se image file, do not reset, upload again the ssl84J boot loader.

After that, turn off the box, replace the sim card to the Nc3 japhar card, and switch on the box.

If you want later to upload another Japhar image file, you can do it with your browser.
Upload the Japhar image file, do not reset, upload the ssl84J boot loader.
Restart your receiver etc..

Some thing you need to know..
When using the Japhar flasher, or other upload program.
Connect the box with the usb service port AND the network cable.
Be sure that your box on the network is connected in the same area as your computer, so in the same (dhcp) ip range.
Check your network leds on the back of the receiver, see if you see some activity.