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Your mistake was very clear....You are trying to flash image for another Box...
You can not flash different image for another box type to your box..
1-Your box DM800 (Genuine) So flash only original image not patched
2-Should be flash only image for DM800 not for DM800se or 500HD or 8000
So:
1-flash last bootloader to your box
2-Close box
3-Then Flash any original image..
You issue Fixed..
So will be close topic under Solved
You can not flash different image for another box type to your box..
1-Your box DM800 (Genuine) So flash only original image not patched
2-Should be flash only image for DM800 not for DM800se or 500HD or 8000
So:
1-flash last bootloader to your box
2-Close box
3-Then Flash any original image..
You issue Fixed..
So will be close topic under Solved