Same issue as zaphodbeeb. Similar specification (PVT4, erasesize 40000, hboot 0.93.0001 etc) and I have tried for months to root, reading every forum entry possible with no luck. Keeps coming back to trying different version of unrevoked, which in turn have led to different error messages (hardware to new, cannot find misc). Have now tried unrevoked 3.21, 3.22, 3.32 with either amonra 2.0.0, 2.0.1 or cwmr 184.108.40.206; have used a Mac, Windows and Slax Linux, all with no joy. Have even gone as far as removing Dropbox as apparently that has caused issues elsewhere.
No modifications made to phone.
If there are any other thoughts, they would be gratefully received.