Nuvo Essentia Six-Source - Manual (Page 26)

Fig. 31
Fig. 31a
23
Firmware Upgrade..
Please Wait
Please note that if multiple Control Pads are plugged in
during the update process they will update themselves one at
a time in succession beginning with zone one. Wait for the
entire process to complete until the last zone turns off.
DO NOT unplug the Control Pads or cycle power during this
process.