Yes, I believe so.
From the 15.0.0.1 release notes:
When replacing a PMP 450 or 450i AP installation with a PMP 450m AP, the following upgrade procedure is recommended:
1. Upgrade the 450/450i AP to 15.0.0.1
2. Upgrade the 450/450i SMs to 15.0.0.1
3. Upgrade the 450m AP to 15.0.0.1
4. Switch over to PMP 450m cnMedusa AP
I had some straggling 450 SMs on 14.1.2 connect to our 450M APs today so I know it works without updating. I did update them to 15.0.0.1 right away though once they were connected.
Yes and No
They will register to a 450M AP in 14.1.2 or 14.2, but they will NOT utilize MU-MIMO beam forming meaning it will run slower than a regular 450i AP
You need to be running 15.0.0.1 to take advantage of the grouping when you go up to 200mbps
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