https://wccftech.com/surface-pro-x-september-2020-firmware-updates-10400-1-77-0/

Microsoft has released a new set of firmware updates for its Surface Pro X, which seems to be getting firmware updates quite often. Today's Surface Pro X firmware updates are available for devices running Windows 10 May 2019 Update (version 1903) and higher. The updates bring several performance improvements focusing on WiFi and Bluetooth, along with system stability.

Microsoft's Surface Pro X is an ultra-thin 2-in-1 device that comes with the signature Alcantara covered backlit keyboard, large multi-touch glass trackpad, and Slim Pen. Once you have installed the latest firmware updates, make sure to restart your device to complete the process through the Start button > Power > Restart.