This method works on Motorola phones running Android OS 2.3.4 or earlier
works on atrix too. confirmed.
http://www.psouza4.com/Bionic/
from the replies, this method does not work on:
Hong Kong/Taiwan model (ME860)
Bell 2.3.6
this other method claims to work on 2.3.6 and ME860
http://www.unlockroot.com/index.htm
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