I need to un-root and restore phone

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http://androidforums.com – Hey guys, my first time posting here. I have Evo 4g that I got 2 years ago and about 1 1/2 years ago I rooted it but I dont even remember how I rooted or with what program and etc. Im going to be getting a new phone and need to unroot this phone and restore to stock settings since I will be giving it to my sister and I dont want her getting confused with all this stuff, lol. Android version 2.2 Baseband Version Kernal version htc-kernal@and18-2 #15 Build number 3.70.651.1 CL294884 release-keys software number 3.70.651.1 from the recovery scre (General)