Help needed...unrooting "Main Version is older"

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http://forum.xda-developers.com – Hello everyone. I need some assistance and I hope I can get some help. I am trying to unroot my phone, I was able to flash s-on, but when I go to load pc36img, I get the following message- "Main version is older! Update Fail!" Do I need an older pc36img file? Or something else? I have attached a picture of my screen showing my info. Thanks in advance for any help. Attached Thumbnails   (HowTos)