RE: HTC Touch Diamond
I own a WM phone as well (Samsung Omnia running custom WM6.5 rom) and I can tell you, the only reason you would want to flash back to original HTC firmware would be if you wanted to send the phone in for a repair. Custom ROMs are much better in terms of speed, efficiency and value.
As long as I know, the downgrade process should be the same (it is for my phone anyway). However this might not be the case for your phone.
You have the intellect comparable to that of a rock. Be proud.
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