Firmware Upgrade Tips
Upgrading an AREDN® node is a straightforward process accomplished using the Setup > Administration > Firmware Update feature on the node's web interface. Follow the procedures documented in the Downloading AREDN Firmware section to ensure you have the correct firmware version from the AREDN® website to install on your node. The newest firmware versions have a built-in check to verify that the firmware image you selected is appropriate for the device on which you are installing it. Earlier firmware versions (3.16.1.x and 220.127.116.11) do not have these checks, so be sure you selected the correct firmware version for your device before starting the upgrade.
Here are some "best practice" tips to assist with the firmware upgrade process. These ensure that memory utilization is at its minimum on the node. The upgrade process can fail due to lack of memory, but such a failure will leave the node unchanged on its previous firmware version.
Before starting the firmware upgrade, it may be necessary to stop, disable, or uninstall Meshchat, hamchat, snmp, and any active tunnels. The goal of this step is to keep those processes from using RAM memory and to free as much RAM as possible before the upgrade. Rebooting the node will ensure that its RAM utilization is at a minimum.
When using a web browser to perform an upgrade, be sure to clear the browser's cache to remove any cached pages remaining from your node's previous firmware version. A clear cache will help to eliminate confusion when displaying node data in the browser.
Use a stepped approach to firmware upgrades. For example, if your node is running version 18.104.22.168 you should probably upgrade to version 22.214.171.124 before attempting to apply a newer version.