I assume that someone else probably used it before you to set up a Zigbee network, so it is not a new new devicice unless you set up the Zigbee network on it and canceled the process or something. If you are really interested about what is on it when you can do a Zigbee network backup to file with that zigpy-cli tools before you reset it. No matter how it happened it will first need to be reset (with the Zigbee network on it removed) before you can start using it.
Anyway, that is based on an old chip and no longer recommend, (so you can never get latest firmware as that chip is end-of-life since a few years back), though it should still work and you can always migrate later if you manage to update the firmware and reset/remove the Zigbee network, though updating firmware on it is not super easy on such older chips, but you can find a script for that specific adapter → GitHub - walthowd/husbzb-firmware: Nortek GoControl HUSBZB-1 / EM3581 Firmware update image
Might be easier to just buy a new more modern adapter and that will not only work better but also be easier to keep firmware up to date on. I recommend that you buy the ”Sonoff ZBDongle-P” model, see → Zigbee buyer's guide