There's really only one way. To preface it, you can not be on the ota. If you are then you can't root it.
Run the cid apk to change your Cid. This is on the original development forum.
Then go to htcdev and unlock your bootloader.
Now you can flash a custom recovery and then flash a superuser package.
Sent from my HTC6435LVW using xda app-developers app