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

[brunla]

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?

 

[Redsnk95]

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.

 

[Krenzy]

No you're correct.