Join Date:Joined: Nov 2010
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There is a solution called J-Tagging, but it isn't practical for us home users. It is only practical for a repair shop or HTC because it is a lot of work and expensive.
What actually happens is that the motherboard is removed from the device, hooked up to a special device which wipes and rewrites the boot partitions completely in a way that can't be done through the recovery or any similar method.
If you can find somebody that can J-Tag Desire HD's, that is where you should go to get the phone fixed. However it is best to send it to HTC if you still have warranty.