Try this mate,it's one of the many excellent guides posted in the red stickies.
Guide: Flashing a Dreambox with Dreamup
Hi Guys If I want to replace my existing image with a ...
If I want to replace my existing image with a different one on a dreambox 500c do I have to select flash erase when i flash the new one?
I,ve already used the Flash with Dreamup sticky very helpful,Im just not sure if I have to press Flash erase when replacing one image to another one.
yes press flash erase that would erase the current image you have on your dreambox and replace it with the 1 you want
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Wipes out your services as well though does it not? Remember to take a back up.