[Q] S-Off and rooted. Can I go back to stock ROM?

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http://forum.xda-developers.com – Hi guys, I have my HTC rezound S-Off and rooted. Yes, I did the wire trick and if I go to the HBOOT it says S-OFF. I am giving up my rezound and the person that wants it want a stock ROM back. If I am not mistaken, once you are S-Off, you can just put the stock RUU into the SD card and rename to PH98IMG.zip and reboot into the bootloader, and that should do the trick correct? Or do I need to lock hboot first and do the whole process again? Thanks a lot in advance, (HowTos)