Originally Posted by SameerH
This was not due to a manufacturing defects but specifically how the upgrade was processed on some early devices (mostly in AU/NZ) which have a slightly different variant of the manufacturing firmware. This problem has since been fixed by adjusting the upgrade package and these customers will no longer experience difficulties in installing firmware regardless of what version they start from.
Hope that helps clear things up a bit.
By 'since been fixed', do you mean in future firmware releases? As 2.1.1 doesn't properly update.