How would I do this.
Go to this thread, which has links to all "how to's" on everything root...
http://androidforums.com/desire-hd-all-things-root/354749-how-root-install-custom-rom-desire-hd.html
The guide in the thread I've linked includes details of how to downgrade and root virtually all versions of Gingerbread firmware (up to 1.37 at present).
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