I am having the same issue, but i have tried step 3, here is what i get
FAILED (remote: not allow) when i try to flash the recovery.img
Just used this for the same issue, worked GREAT!!!!!!!! Thanks.
DROID ERIS by HTC Impact Case // OtterBox.com
Just a suggestion. :p
I use this one as well. Phone runs great with it. Plenty fast and battery life seems much better.
Got my Eris a few months ago and am now addicted.