Warning: If something goes wrong, whatever you do, do NOT install the update that this process finds. If you DO, you will be stuck on 2.20 with no chance for root (currently)
What you need:
HOX on ATT 1.85
su binary from http://dl.dropbox.com/u/don'tusemeimabadsubinary
EDIT: The su binary above has issues. Use this one instead: http://dl.dropbox.com/u/9060692/su
Make sure HTC sync is NOT RUNNING (down in system tray)
Make sure phone is set to "charge only" and usb debugging is enabled!
Put su in same directory as ADB. Get to adb command prompt and cd into that directory
NEW - pull sim card
NEW - do factory reset
NEW - when reset is complete, do not replace sim, do NOT connect to wifi. Go through setup, go to settings, enable USB debugging. When that's done:
adb shell rm /data/data/com.redbend.vdmc/lib/libvd*
After the device reboots:
adb shell ln -s /data/local.prop /data/data/com.redbend.vdmc/lib/libvdmscomo.so
(If you get file doesn't exist after the FIRST command don't worry - they may not be there)
Now, on the phone, go to settings and check for software update. It will tell you you need to connect to network. Now, replace the SIM OR connect to wifi. Have it check for software update again. When it's done, do NOT click "yes" or "ok" on the phone. Simply:
adb shell ls -l /data/local.prop
IF AND ONLY IF you get "file not exists" or anything like that then set your phone's date 2 days ahead and reboot the phone and start over. If you get file info, you're golden. Proceed....
adb shell "echo 'ro.kernel.qemu=1' > /data/local.prop"
Now it's time to reboot
After phones reboots
adb push su /system/xbin/su
adb shell chown 0.0 /system/xbin/su
adb shell chmod 06755 /system/xbin/su
adb shell rm /data/local.prop
Congrats, you have root. Install supersu and busybox installer from the market (or Play store).
If you pledged a bounty in the bounty thread, note the instructions here:
Please pay bounty to make a wish foundation
Please choose the "Make a Wish Foundation of America" (don't select a chapter). You can use Paypal as well.
Special thanks to designgears as well for being my tester and also writing the one click. He has several hours of work in this project as well. Consider a donation to him, too - http://rootzwiki.com/store
ADDED: Please let me know if this works for you!
ADDED: If you already pushed the wrong binary it's easiest just to start over with the correct binary.