A factory reset will remove the config, but once the switch checks back in, it will re-apply the saved config assigned for that serial number, in the Network in which it's logically deployed. If you want the switch to not load a duff setting, remove the duff setting in Dashboard, before it checks back in. You may (also) find switches reverting to a locally stored Safe Config, if they can't get back to Dashboard any other way. https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Behavior_during_Connection_Loss_to_Cisco_Meraki_Cloud#MS_switch
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