Flashing Back to Sprint

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I have a Nexus S 4g that I flash to Verizon Prepaid (Pageplus cellular) using these instructions: http://bubhutsa.blogspot.com/2011/11...-pageplus.html

What's the best / easiest way to flash it back to Sprint since the phone has to be returned? Will a factory reset do this?

Update for anyone interested:

I found a Sprint PRL, and flashed the phone back to that, along with factory resetting the device. It correctly connected to Sprint towers after this.