There are several ways to update your NovoConnect X300, X700 and X900 devices.
(1) Update via Remote Manager
This method allows you to manage the firmware update from your computer. This article has the details.
(2) Update from the Device
You can connect a USB mouse to the X300/X700/X900 device and trigger the online firmware update (which may be referred to as OTA update).
To do so, click on Device Settings and follow the on-screen instructions to proceed.
(3) Update with a microSD card
This method will wipe out everything on the X700 or X900 device and result in a clean installation. Please follow this link for details.