Instability with ePMP 1000 and 2000 APs running 4.43 and SMs running 3.5.6?

We are trying to upgrade our ePMP APs to 4.4.3 with the plan that we will start deploying F-300 SMs in the field, rather than F-200s. I had made sure all SMs were running 3.5.6, and I upgraded a few APs to 4.4.3 - most SMs connected just fine, and were stable, but a lot of SMs would connect for a few minutes and drop, over and over again. Rebooting didn't solve it, nor did full a power-cycle on the SMs, so I reverted the APs to 3.5.6, and all is stable again.

Since I haven't seen any issues running 4.4.x SMs on a 3.56 AP, I'm hoping I can try a "SMs first, then AP" cnMaestro update to 4.4.3, and I won't see the problem that way, but I admit, I am wary. Is this a known issue? Is there a workaround, or is updating all SMs, then the AP, the best way to do it?

We always run the same version on AP and SM.  At least with Major versions (3.x vs 4.x).  And both just with Cambium gear...  we have always had better results with all brands be keeping firmware versions the same. :)

We recently did the same, for the same reasons, and yes, we found that doing SMs first, then AP in cnMaestro worked best. Most SMs running 3.1 or later could connect to an AP running 4.4.3, but we always had a few on each AP which would connect and drop off, over and over again. Doing the SM first setting made everything go by much more smoothly.

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