Flashing an image on a 800hd

Quote from dathai60

Have done this several times but this time is confusing when i use dreamup it starts up and when i connect and switch on box it tells me box type and underneath it says Unable to ping the box,using serial cable. should i still flash or does it make any difference ie will it flash ok Thanks

You dont say what you have tried so try this method
DM800 Flashing firmware by Browser

If the box is not responding look here

[h=3]DreamUP Patched dm800 clone ( fix no ca error)[/h]
[h=3]Dreambox NO CA FOUND Repair Tool SIM2/01 EDition[/h]
[h=3]Dreambox OptiFlasher Enigma2 EDition Latest Version[/h]