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What do you mean? EP is entry point of an app, OEP means usually the ep of a packed application (being ep the entry of the packer stub).
If your app isnt packed, then just alter the ep in the pe header.
If you are worrying of altering middle app code, just restore such original code after the jump to your stub, by mov-ing it back, removing tracks of any change you made.
Or do you mean something like "altering the OEP of a packed application"?
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