My phone is dropping calls like crazy and I want to return it to 100% stock before I take it in to the Verizon store. I rooted the phone so I could have a Wireless hot spot.

So what is the best way to get rid of SPRecovery and go back to a 100% stock phone? I've searched on Google and on here and can't find an answer to my question. I saw some talk of "SMUpdate" but I can't find where to download it (The thread I saw it in mentioned downloading it from the market but its not listed there)