Default How To Unistall MIUI?

Today I tried to put the MIUI ROM, but I do not like. Now I do not know how do you uninstall and reinstall the Android version that I had previously.
With CWM-based Recovery program that was initiated to install MIUI I had effetturare backup, but not to do stupid things and do not touch any trouble at all.
If you tell me the procedure to do thank you very much.
Whether or not there are alternatives I should do a "Hard Reset"?

Sorry. Resolved.
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