Merge pull request #38 from kc0euw/docDev

Add sysupgrade option for installs

arednGettingStarted/installing_firmware.rst

@@ -217,6 +217,16 @@ Instead of a *Connection Reset* message, sometimes a *Bad Gateway* message may a
 * Use a different web browser program or a *Safe Mode / Incognito* browser window.
 * Unplug and reconnect the Ethernet cable from your computer to ensure that your machine has received a new DHCP IP address on the same subnet as the node's updated IP.
 
+If for some reason the node's web interface does not work, you may be able to use a command line program to install the firmware image. You must first copy the firmware *bin* file to the node, then log into the node and use the *sysupgrade* program to install the image as illustrated below.
+
+>>>
+my-computer:$ scp -P 2222 aredn-firmware-filename.bin root@192.168.1.1:/tmp
+my-computer:$ ssh -p 2222 root@192.168.1.1
+~~~~~~~ after logging into the node as root (hsmm) ~~~~~~~
+node:# sysupgrade -n /tmp/aredn-firmware-filename.bin
+
+Additional questions and troubleshooting assistance can usually be obtained by creating a post on the AREDN |trade| `online forum <https://www.arednmesh.org/forum>`_, which has an active community of helpful and experienced operators.
+
 Post-Install Steps
 ------------------