For some reason, if you need to unroot your HTC Evo 3D back to stock, here’s how to do it if you used Revolutionary root method (won’t work if you are on HBOOT 1.50 and rooted with HTC Method!). Also, Sprint isn’t so tough about returning rooted phones, last week I returned my Evo 3D with root(HTC Method) and ROM because I kept getting error 16, got an exchange no questions asked!
Step 1. Download PC86IMG.zip file here then copy over to the root folder of your Evo 3D’s SD card:
Step 2. Make sure Fastboot is checked OFF under Settings->Power.
Step 3. Turn your Evo 3D off then boot into bootloader by holding down Volume down and Power button together.
Step 4. Wait until your phone recognizes PC86IMG.zip file, then hit Volume Up button to start the flashing process.
Step 5. When it’s done reboot and you should be back on a stock ROM without SuperUser.
Step 6. Erase PC86IMG.zip on your SD Card as we need to get into fastboot mode.
Step 7. Download Fastboot.zip and unzip to the root folder of your hard drive.
Step 8. Put your phone into fastboot mode by rebooting into bootloader (like Step 4) then choose Fastboot in bootloader and connect the USB cable to your computer. You should see “Fastboot USB” on your Evo 3D.
Step 9. Open up a command prompt or terminal on your computer and browse to your fastboot directory by typing:
for Windows or
fastboot oem writesecureflag 3
for Windows or
./fastboot-mac oem writesecureflag 3
for Mac or
./fastboot-linux oem writesecureflag 3
That should be it, when you reboot your bootloader, you will get S-ON.
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