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HELP!!! I'm having the same problem on my HTC EVO and am very frustrated! I have seemed to have done all the steps, but can only maintain Root through Unrevoked3 for 1-2 minutes before my phone reboots and I get the same error:
Error: failed to get root. Is your firmware too new?
I have factory reset my phone, and it still is happening. I have the same ability to Root, both on my Windows machine and my Macbook, and I can do perform tasks during this brief period of time. But they both loose the connection, my phone reboots, and I get the error message again.
Any other suggestions please???
Thanks.
So what should my next step(s) be at this point.OK, so the first time I ran this it went through ok and said "done".
But I have S-ON still.
I tried again and now I get the "too new" error.
Downloaded terminal and can su to # - and see files in /data - but I still cannot uninstall factory apps, I guess because I need S-OFF?
I have a GSM Desire, HBOOT-0.93.0001
Do I need to user AlphaRev...?
.

I had this problem and tried everything suggested above, but none of it worked.
In the end the solution that worked for me was to use the earlier unrevoked 3.21. Worked with no problems at all, really straight forward.
I downloaded it from here Download unrEVOked 3.21.exe from Sendspace.com - send big files the easy way (got the link from xda-dev forum, but can't remember the exact page and who to credit for it).
I was attempting to root my phone using the instructions found here http://androidforums.com/evo-4g-all-things-root/194918-rooting-dummies-extras-18.html
When I run reflash_package.exe everything goes well until it says "Running Root..." After a while I get the following error:
Now I am at a loss as to what I need to do/know so I can complete the root successfully.
Anyone able to help?
Thanks!
Lol, it did work factory reseting weird, maybe its just some stupid excuse for something