Hey there, Connor here from Meraki Support.
Support *can* upgrade one AP if you're encountering, for example, an issue that is fixed in a particular version of MR firmware. We typically advise instead to place the MR in a separate network, as when support *pins* a device to a specific firmware version, you can't upgrade it yourself so you'll need to email/call in again, which makes quickly testing/upgrading a little cumbersome if it's during the day and there is a wait time.
You can clone a network's configuration as Philip pointed out, which means it'll broadcast the same SSID etc. Once you've created the new network, go to Organisation > Firmware Upgrades and only select the temporary network for te upgrade.
Kind regards,
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Connor Loughlin
Network Support Engineer
.:|:.:|:. Cisco Meraki EMEAR
🇬🇧For reference, many questions can be easily answered by searching our online documentation:
http://documentation.meraki.com