Can't flash openpli

I updated my dreambox through software update and there came a massage about "something wrong with your image do you want to update" and i hit yes then the dreambox didn't boot so i tried flashing it but i get error "INVALID IMAGE (OR OLD VERSION)" I can flash the official firmware but when i try flashing openpli versions i get the error "INVALID IMAGE (OR OLD VERSION)"

DM500hd

DM500HD second stage loader #84 (2011-09-01)

Thanks