I am also seeing this regarding the upgrade: https://documentation.meraki.com/Wireless/Design_and_Configure/Deployment_Guides/Campus_Gateway_Deployment_Guide#Software_Upgrades "It will be mandatory to keep the CG and AP firmware versions identical. For example, if the CG is updated to MCG31.2.5, the APs will need to run MR31.2.5 as well." "During the firmware upgrade, Dashboard will upgrade the CG first followed by the AP." "During the upgrade, all the Campus Gateways in the cluster will upgrade to the new code version at the same time. Once they are done, all the APs in the network will be upgraded at the same time."
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