Step By Step with Screen Shots! ;)

To Go back to the First Page CLICK [HERE]
Instructions
STEPS:
1) Unlock bootloader with HTCDev.com (guide here under section "HTC bootloader unlocker"). When you're done, it should look like the below picture:

2) While in Bootloader, switch to "FASTBOOT" mode by highlighting "FASTBOOT" option and pressing the Power button. The menu options should change, and it should now say "FASTBOOT USB" (see this picture).

3) Install custom recovery (previously downloaded from OP) using fastboot
Code:
fastboot flash recovery [name of recovery file]

-OR-


Android Flasher

4) Boot into recovery, flash latest superuser (3.07, with 3.0.3.2 binary

NOTE: If you get an error when flashing this zip file (i.e. signature verification failed), there is an option to "Toggle Signature Verification" under the "Flash zip menu". Do that, and then try flashing again.

5) Reboot device, enable USB Debugging (Settings -> Applications -> Development), and disable "Fast Boot".

6) Connect device to computer ("Charge only" mode), open command prompt, and navigate to location of "adb" from HTCDev unlocking process.

7) Run the command "adb shell".

8) If "$" appears, you do not have root access. Type "su" to access root. "$" should change to a "#".
NOTE: If it doesn't change (though I don't know why it wouldn't), go to Market (signing into Google will be required), and download "Root Checker". Open Root Checker, and you should be prompted to allow root access. If successful, type "su" at the adb prompt again, and you should have root.

9) Using the previously downloaded "flash_image.zip" & "mtd-eng.zip", extract the files contained in the zips. Put the flash_image and mtd-eng.img on the root of your sdcard. Then, input the following commands, as seen in the picture below:

Code:
cat /sdcard/flash_image > /data/flash_image [ENTER]
chmod 755 /data/flash_image [ENTER]
/data/flash_image misc /sdcard/mtd-eng.img [ENTER]

Once the misc partition has been updated (i.e. the last command above has been run, and there are no errors), you can close the adb shell (by typing "exit") and proceed to the next step - downgrade your Bootloader and HBOOT to a non-watermarked version rootable with unrevoked.

10) Using the previously downloaded Froyo PC36IMG.zip from the OP, rename to "PC36IMG.zip", and place on root of SD Card. Reboot into Bootloader, and follow the prompts to update device (Notice in the below picture that the watermark shows as "LOCKED" again).

11) Once the update is complete, you will have HBOOT 2.10 and radio 2.15.00.11.19, which is rootable with unrevoked (Notice that the watermark is now COMPLETELY gone!).

You will need to use unrevoked3, which will install a custom recovery and unlock your NAND with unrevoked forever (Wiki HERE, guide HERE - starting under "SECTION 2: ROOTING PROCEDURE"). TIP: Make sure your device is disconnected when first running the unrevoked3 "reflash_package.exe". When it opens, choose "File", then "Custom Recovery ...". Navigate to the location of your preferred RA recovery.img file, and select. Then, when it's done, you'll be NAND unlocked, and have your preferred custom recovery!

All Done!!

THIS IS A VIDEO GUIDE OF FROM UNLOCKING TO ROOTING EVO 4G!