You should first update to v2.9.3 and then Upgrade to v3.1.5. This will allow you to switch between v2.9.3 and v3 (and up) as needed depending on other hardware in your venue.
Prior to v2.9 does not support this toggle and will require you to reinstall v3.x to regain access each time.
Thank you very much for your advice.
Thank you very much for your advice.
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