Hey.
I assume this is under the "restore" tab, right?
Follow the guide - click the "path" button, and locate the "d8b-51&plugins.adi" file.
Go through the guide step by step.
If it still doesn't boot, something is likely wrong elsewhere.
B.t.w. - do you have the "new" motherboard, or the "old" one?
(you can check here:)
http://www.sonido-7.com/d8b/maintenance.html#Post14