9 upgrading the vs-121hc firmware, 1 upgrading the device firmware, 1 downloading from the internet – Kramer Electronics VS-121HC User Manual

Page 21: 2 connecting a pc to the rs-232 port, Upgrading the vs-121hc firmware, Upgrading the device firmware, Downloading from the internet, Connecting a pc to the rs-232 port, 9upgrading the vs-121hc firmware