Any Axon with a serial number starting with 76CB or later will support 9 layers when v2.0 is released. Units with a serial number starting with 76CA will be expanded to 4 layers.
A little more specifically, any Axon that has the original Intel D915GUX motherboard will be upgraded to 4 layers all others will get up to 9 layers.
There are a number of the 76CA units floating around out there that previously had the hardware upgraded in them for various reasons, so if you have a 76CA unit it depends on what is currently inside it as to what it will be capable of.
Contact your Sales Rep for the region you are in or call our Support dept.
We don't do kits for Axon upgrades because there is too much assembly involved and things can be too easily damaged or performed incorrectly that will cause problems.
For a unit as old as a 76CA, it really isn't even a practical upgrade as there is literally nothing other than the Blue doors on the front that are the same as current production and is essentially the same as buying a new unit. Again, talk with the Sales rep but if it is that old you might be best off selling it and getting a newer unit.