Originally Posted by Nikusha04
I'm done with recovery trying to install RUU downloaded from HTC site , but gives me error ERROR  THE ROM Update utility cannot update your Android phone. Please get the correct ROM update Utility and try again. Phone is unlocked now should i relock it ?
Yes, the bootloader needs to be relocked to run RUU (unless you have s-off).
You have the AT&T variant, right? What is your hboot number?
As long as you have the AT&T version, and yourhboot number is 3.16, the 1.58.502 RUU is the right one.