I have the ACT4 20 channels
switch off the unit with the rear panel power button.
switch off all the sources , power amps and subwoofer, TV etc
connect your computer to the ACT4 with mini USB cable
switch on the ACT4 with the rear button
run the msi.exe file ( the firmware ) on your computer
you will see an icon of the ACT4 and a firmware number on the computer screen
click on the firmware number
The unit will turn off and on several time by itself.
it takes about 40 minutes for the firmware to be installed.
you can always ask your dealer to do it for you with Team Viewer
ACT4 can be diagnosed with Team Viewer .
They provide a very good service
Every time there is a firmware update , I have to read again the note about the way to do it.
But once you have done it right, the firmware update is rather easy.
Good luck
switch off the unit with the rear panel power button.
switch off all the sources , power amps and subwoofer, TV etc
connect your computer to the ACT4 with mini USB cable
switch on the ACT4 with the rear button
run the msi.exe file ( the firmware ) on your computer
you will see an icon of the ACT4 and a firmware number on the computer screen
click on the firmware number
The unit will turn off and on several time by itself.
it takes about 40 minutes for the firmware to be installed.
you can always ask your dealer to do it for you with Team Viewer
ACT4 can be diagnosed with Team Viewer .
They provide a very good service
Every time there is a firmware update , I have to read again the note about the way to do it.
But once you have done it right, the firmware update is rather easy.
Good luck