You have a couple of options:
1) Simply have your PC connected to both the amplifier (ethernet) and Internet (WiFi)
Within Armonìa go to the Firmware updater page and perform the update.
2) Have a look at the X Series quickguide, available in the product page and at the following address:
http://www.powersoft-audio.com/en/docma ... guide/file
You will need to download a File and perform the update through a usb stick.
In order to download the file you need to register your product with the following form:
http://www.powersoft-audio.com/en/restr ... gistration
After that you'll be able to see the X Series users area at the following link:
Let me know if you need further help,
Anything about the software inside the hardware incl FW package for download...