If you actually read the document fully it says this:
Upgrading A 1.4 or 1.5 Image to 1.6
Note: This section does not reflect reality yet; however, we are working on getting the script to correctly update a 1.4 or 1.5 image to 1.6. We decided to document it now, and then get the script to match the documentation.
It has been already covered here: http://forums.oztivo.net/showthread.php?t=1234
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