Originally Posted by jefboyardee
I ended up taking it to the Sprint store, provided a feeble story and they did a really hard boot.
I'm sorry that you had trouble with the downgrade to ZVD. I've modified my instructions above, adding an optional "wipe-data/factory-reset" step for people who have problems. It's probably what the folks at the Sprint store did for you.
You didn't root your phone. You just installed the stock Sprint ZVD ROM from the Sprint website. Sprint put that ZVD ROM (and downgrade instructions) on their website for people who were unhappy with ZVH.
At this point, if you're on ZVD, you'd find it easy to follow the main part of the guide if you want to root and install a custom ROM.