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Root Need to send phone back, how to revert?

just flash the sbf file. if you have 2.2ota, then use the 2.2 full sbf. if you never got 2.2 ota, then use the 2.1 sbf. go to the rootzwiki site for the files and instructions

So if your rooted with the 2.2 OTA. Do you first have to unroot it inorder to do the 2.2 full sbf flash. I ask because I'm having trouble setting setcpu it not recognizing the app as an SU app and I have tried everything other than fully flashing phone.
 
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