Can't ROOT it again!

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http://forum.xda-developers.com – Hey guys, I got a problem, that I can't root my Desire again, and I don't know why. My Desire was once rooted, but I unrooted after installing the original RUU 2.2. version of android, After that, I installed 2,3,3 version, but I can't boot it. It shows me some black screen on boot. I updated to HBOOT with the official ruu upgrades. Now I can't get back on track and root it again with revolutionary (cause it supports only 2 older hboot versions). Tried with unlocking the bootloader from htcdev, not completing the final step with copying the code because it showed no one at c (HowTos)