EdgeOS firmware update method
How to Update EdgeMax Firmware:
Go to the Ubiquiti website (https://ui.com/downloads/) and select the EdgeMax series downloads. Then select the device you wish to upgrade and download the firmware applicable to your device:
Open the Web user interface of your EdgeMax Device
Open the System tab at the Bottom of the UI of your device and upload the firmware to your device that you just downloaded:
Once the Firmware has been uploaded, click the “Reboot” button and wait for the device to update: