Thanks everyone for your feedback and assistance. As identified, my VPD file was corrupt, and without the Model and Serial info, that seemed to be stopping Frontview, etc from working correctly.
Only someone with the correct Netgear tools can re-create that VPD file, luckily I've been given the help privately to restore my Serial, etc back info the unit, and we are back up and running again. Sounds like I may not have specifically done anything wrong with what I did with the unit, it is just unfortunately a scenario that can happen on these older units. Fortunately fixable, I guess just a possible scenario to be aware of for anyone else thinking of the OS4 to OS6 upgrade.
