Download a zip file for your VuPlus model from http://code.vuplus.com.
Unzip the zip file and you will have vuplus folder and under the folder, you have another folder named after the model of your VuPlus set.
Copy vuplus folder (including all the sub folders and files in it) to root folder of an USB memory.
Turn off your VuPlus set and insert the USB memory to USB port on the set.
Turn on the set.

For Duo: Update is done when complete message is displayed on the VFD.

For Solo: Update is done when green light blinks on the front panel.

For Uno: Push Ch- button when message shows. Update is done when complete message is displayed on the VFD.

For Ultimo: Push – button when message shows. Update is done when complete message is displayed on the VFD.

For Solo2: Push power button when message shows. Update is done when complete message is displayed on the VFD.

For SoloSE: Update is in progress when the white light becomes gradually bright and dark on the front panel.
Update is done when white light blinks on the front panel.

Remove the USB memory and turn off the set and back on.