reset my HTC diamond phone

I am selling my old HTC diamond phone and want to know how to delete everything / reset.

Many thanks
nathan1038Asked:
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Mikal613Connect With a Mentor Commented:
a) there is a Clear Storage in either programs or settings

or
b)Hold down Power + Vol Down + Enter
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Mikal613Commented:
"program/setting/system/ clear storage, enter 1234 and it will hard reset your system.
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