Problems with unrooting

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Need to unroot my HTC Desire (unbranded).

But after trying 3 different RUU´s, im still stuck on the HTC Boot logo (guessing its the HBOOT).

Im pretty sure its because my phone enables USB debugging by default, which I tried to disable, but seems that after a reboot it just defaults to it again..

Anyone know how to resolve this problem, or got another solution on how to unroot my phone ?

My phone is currently running the 0.80 bootloader, and im currently running the MCR 3.1 rom.

downgrade hboot to 0.75 and you can flash an "older" rom
i had the same problem with a vodafone branded Desire

EDIT: and dont forget the goldcard