[EVO 4G Q&A, Help & Troubleshooting] sevenpillars:
This a copped post from djR3Z whom i thank for the guide in the first place. The reason that I am reposting this is because it took me countless hours and more help form other members to make this work for me. When I started this unroot process I did not have my HTC Sync drivers installed and when I ran the RUU program it would see my Evo for a second then lose the connection. After installing the HTC Sync drivers all went easy and I was unrooted in about 12 minutes. Again thank you to djR3Z and to all that commented on my original post for helping me get unrooted.

A lot of you have been asking for how to unroot the EVO, either because you're having problems and want to start over or you are returning your phone and need to have it unrooted. I've had nothing but trouble in the past trying to unroot using other methods, especially using the RUU on a PC. It always fails for me. Well here is the most simple guide to unroot!! Thanks to regaw for helping me with this, hosting, and the Unrevoked team for the S-ON tool!

HOW TO UNROOT THE EVO VIDEO WALKTHROUGH

How to Unroot the HTC EVO 4G

◄●REQUIRED DOWNLOADS●►

Unrevoked S-On Tool

PC36IMG

◄●SIMPLE INSTRUCTIONS●►

If you're comfortable with everything Android related(flashing, recovery, etc.) then its just 2 simple steps:

If you used Unrevoked Forever at any time, flash unrevoked-forever-son.zip from recovery until hboot shows S-ON

Flash the PC36IMG.zip from hboot

◄●DETAILED INSTRUCTIONS●►

If you need a little more guidance, follow these instructions.

◄●If you have used Unrevoked forever, start here●►

Make sure you have downloaded the files linked above. Do not extract them

Connect your phone to your computer via USB and change to "Disk Drive" by dragging down from the notification bar.

If you have NOT used Unrevoked Forever, skip to the instructions below. If you have, transfer unrevoked-forever-son.zip to the root of your sdcard. Do NOT transfer the PC36IMG yet. It'll only cause a hassle and make this take longer.

Once complete, power off the phone

reboot into the recovery by holding VOL DOWN + POWER until it boots to the white screen. Then select RECOVERY.

Depending on what recovery you're using, you need to flash a zip. Select the unrevoked-foreverson.zip that you just transferred and complete the flash.

When complete, power off the phone. Reboot into the bootloader by holding VOL DOWN + POWER until it boots to the white screen. If it says S-ON at the top, select RECOVERY and skip to step 9. If it says S-OFF, repeat steps 5-7 Until it does.

◄●If you have NEVER used Unrevoked forever, start here●►

Power off the phone and reboot into the recovery by holding VOL DOWN + POWER until it boots to the white screen. Then select RECOVERY.

Connect via USB. There is an option for this in both Amon RA and Clockwork.

Transfer the PC36IMG.zip to the root of your sdcard.

EJECT THE PHONE FROM THE COMPUTER and then turn off USB in Recovery

Power off the phone and reboot into the bootloader by holding VOL DOWN + POWER until it boots to the white screen.

It should check the PC36IMG.zip and then ask you YES/NO to apply the update. Press VOL UP for YES

Once complete, Press VOL UP to reboot.

You are now unrooted!