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Following the step-by-step documentation from Cisco here: Release Notes for Cisco Catalyst 9200 Series SwitchesAfter doing the final reload, the old IOS is still what is booted to. I have cleaned up, set boot to packages.conf, installed the new IOS, ...
So, it half worked? For some reason it updated switch 1, but this was a two switch stack, and caused a version mismatch. Remotely, when I SSH'd into the stack, it dumped me in switch 2, so in order to get them back up and running (prod environment), ...