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Return to Stock/Unroot
To return to stock we use something called an RUU. This completely wipes your phone and returns it to the condition it was out of the box software wise.
Follow the Guide here to return to stock Evo V 4G RUU Flashing guide / Unroot guide
Top of the forum, the FAQ sticky contains this answer:
One problem when i try to lock the bootloader it says command error , can I just skip this step and run the ruu?
If you made a backup of your system before doing anything to it besides changing the recovery, just restore that backup and you'll have an unrooted stock phone. Then change the recovery back to the HTC recovery.
One problem when i try to lock the bootloader it says command error , can I just skip this step and run the ruu?
fastboot oem writesecureflag 3
Make sure you have the stock 1.57 hboot installed before running that command or it will brick your phone. Use VolumeDown+Power to get into the bootloader and confirm the version shows as 1.57.0000.This is probably because you are s-off. To go back to s-on, run the command
Code:fastboot oem writesecureflag 3
Then continue on with the guide and try again to run the command to lock the bootloader.
the phone is probably worth more rooted with s-off