I am having the same problem with my brand new Sony PRS-T2 with firmware 1.0.04.11081 (not 1.0.05.12140). I cannot root the device. It simply reboots, that's it.
As all other people here I am hoping for a solution as I want to use the Onleihe Android app on the device as well as one or two "living room" apps like MPDroid.
Cheers,
Roi
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