How do I unroot my Evo (using unrevoked 3.21) O.k so I have an H.T.C Evo with Froyo 2.2, and I recently rooted it using unRevoked 3.21 but now i'm having some issues with my phone and would like to return it back to sprint. How do I remove the root and change the evo back to stock version so I can take my phone into sprint for a checkup. Can someone pleaaaaaaasssssssse help me? My phone is moving like a turtle.
You could start with this method. It's basically just two steps:


If you used Unrevoked Forever on
your phone, then flash their S-ON
tool.
Flash a stock PC36IMG.zip
from HBoot.


There's also the RUU method, though I think you'd still need to run the S-ON tool if you used Unrevoked Forever (I don't believe the RUU will re-enable S-ON). Either one of these should get you back to a stock unrooted system.