pull out the power from the dreambox.

Connect nullmodem cable to dreambox and pc.

start dreamup select the right comport, and network details if applicable.
press Connect.
Start the dreambox, DreamUP will state that it found dreambox-xx and upload its loader to it. After that you can choose an image from your disk to flash it with by pressing flash.

http://www.dreamboxshops.co.uk/dreambox/DreamUP.zip