How does one "unroot" if you need to return the phone?

brunla

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I rooted using Razrblade method and was just wondering how you unroot and go back to stock JB if needed? Will a simple FDR do it?
 
The Razr has a status checker, even if you unroot there is still evidence that the device was rooted in the past. Someone correct me if I am wrong.
 
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