What is RUU? It stands for ROM Update Utility, and it is essentially official updates that will revert your phone to an OEM factory state (what you had before rooting). Note that if you are s-on, your RUU MUST have your CID to be compatible, as well as matching (or lower version) radio & hboot.
To get your phone's info, type "fastboot getvar cid" in cmd
How do you use RUU?
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For .exe files:
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For zips:
Fastboot flash zip firmware.zip
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***Note: I myself have not done this before so I lack expertise in this area***