1. Make sure you have S-ON, to turn S-ON (Download File
Here) Transfer the file to your SD card as a zip.
2. Power off your device, after device power down, Hold down the Volume Down button and Press the Power on Button.
3. You should now be in HBOOT Bootloader, press the volume down to Recover, push the power button to select Recover. Wait, Bootloader will boot into Recover, select "Install Zip from SD card" the select "Choose Zip from SD card" then select "unrevoked-forever.zip"
4. After completed, reboot system.
(before continuing, I recommend doing a nand backup in Clockwork Mod Recovery)
If you already have S-ON start here.
5. Download the PC36IMG file
here after download, rename the file to PC36IMG.zip with the PC36IMG in all caps, make sure your file looks like this PC36IMG.zip and not PC36IMG.zip.zip
6. Transfer the file PC36IMG.zip to your SD card.
7. Power off the phone, once phone is powered off, hold down volume button and press the power button to load into Bootloader.
8. Bootloader will extract contents of PC36IMG.zip and ask if you want to continue, select YES.
9. Allow phone to go through this process, don't touch it unless it asks you a question.
10. You are now unrooted, go to settings>system updates>HTC software updates>check now
11. Download Gingerbread!
Credits to
Mr.ESP for Roms