Arris Firmware update can be easily done without the help of a technician. For that, you have to enter the default IP address in a web browser and download the most recent version of the firmware. Let’s have a look at step by step process of how to update router firmware Arris. Steps to download Arris firmware-  Select the status from the setup page of the router.  A drop down menu will appear, select the router upgrade.  Go to the file you downloaded from the router interface.  Click on upgrade and confirm.  The firmware will be downloaded and installed.  Do not run any other command or switch off the router during the process.