The Noorio App will auto-check devices' updates and notify you to update your devices. You can also manually check for a device's update via the device's Camera Settings -> About Device -> Firmware Version.
If the device is battery powered, charge your device first if its battery life is less than 20%. If not, be reminded to DO NOT unplug the power cable.
Be patient during the update, it usually takes 15 minutes to update firmware depending on the network.