There is a Host Code that will do both with the right Flashcode. I've seen it work. This is how the state of Colorado was able to upgrade from 3600 to 9600. They had the radios upgraded and then made the switch (at the same time) to a new zone that was set up for 9600.
Without that capability, it would not be possible to upgrade a system that has a large number of XTS 3Ks without taking an outage (which public safety can't do).
Apparently with this "special" Host Code you lose some features in the radio. One of them is the Private Call capability. This is because of a memory limitation in the radio. Newer radios don't have this problem.
I don't know what the Host version number is, but it does exist. Mot. may only give it to people that need to upgrade from 3600 to 9600.
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