good idea on asking for this info,obscuro.
darksideofjae,id be willing to bet it wont take becasue you are not on 2.01.605.11 firmware(indicted by 2.10 hboot).
i believe to get this to work,you will need to:
-backup your data as described
-relock and run full
ruu for 2.01.605.11
-relaunch recovery and restore data
i believe that then step 4 will work
2.10 is the hboot for 1.02.605.6. so,alternately, restoring that may let you OTA to 2.01.605.11,then to 2.01.605.12,then to 3.14.605.12