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I don't have it. I see all the modes and it just isn't there lolIf you mean the Zoop Novo it has a nitrox mode. If it's a Novo it's the successor to the Zoop so came out ca. 2016. It's not like an old Aladin/Monitor, etc which had air only models early on.
Nitrox mode is a pain to get to (just one reason why I hate the Zoop) but it's there.