How to unlock zte v793 to factory?

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Volume Up+Power, when the Android logo appears press home buton then select wipe Data/ Factory reset, then press menu buton, and finaly reset. Sorry for my bad english.  more
the Android logo appears but no where to select so how  more
... logo appears. Select Wipe Data/ Factory reset from the service menu ... will restore itself to the factory state. The pattern does not ...   more

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