After upgrading to firmware version 1.11 I see print services seem to be intact. Maybe the readme from the download site is referring to something else.
To elaborate on why I would like to open the firmware file, I would like to customize it for use with future systems to be configured. I realize that I can just modify the filesystem on each dom but that would be considerably more time consuming than modifying it via firmware upgrade.
Can we take the lack of response as a "No, It won't be upgraded"?