DREAMBOX dm500s problem flash

[vasilism13]

hello my friends i had a dm500s with pli.
the box stopeed boot and i tried to flash it with null cable and dream up.THe problem is that when i upload an image (yes i tried the official) dream up has the opinion to select an erase flash or not.
if i press yes dream up gives me this :
ERROR, flash-erase failed, box will be unusable now!!
if i press no upload and flashing is ok but box cant boot,
stacks when i select the time, and makes a reboot.
i have watched-but cant see because it appears for a very litle time-an error message to my screen with a X symbol when tries to boot after time selection.
i have tried a diferent machine, a different ccable and the images: rl (oficial) , gemini , pli , nemesis.
erase.img gaves me this :Found no valid jffs2 in image, flash-erase not supported

any suggestion plz?
edit- sorry for my english!