Hello, I have seem to have a failed upgrade from 13.2.1 to 14.0.1 on a u25 appliance. It is stuck on "service unavailable" in the web gui. Direct attached monitor eventually shows the untangle desktop, but I seem to have no mouse control. Command center showed 100% RAM use... not sure what this all indicates, but with untangle unresponsive to my skill set, I've forged ahead with downloading the IMG for 14.0.1 onto a USB drive. I suppose a clean install and restore from back up is the next step... however, I've not found what the key combo is to boot from the USB. Any suggestions?