1. set En-US keyboard layout

See: debian wiki, raspi howto.

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dpkg-reconfigure keyboard-configuration
  # Generic 105-key PC (intl.)
  # English (US) - English (intl., with AltGr dead keys)
  # Right Alt (AltGr)
  # No compose key

Italian accented letters:

• AltGr+[aeiou] | AltGr+', [aeiou] = [áéíóú]
• AltGr+`, [aeiou] = àèìòù
• AltGr+; = ¶
• AltGr+: = °

2. compile flashing tool

Download dfu-programmer source.

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./bootstrap.sh
./configure
make
ls -l src/dfu-programmer

3. create layout & download its firmware

1. Open the layout maker (docs)
2. Load a previous .json layout file (see attachment)
3. Preferences: settings > dark mode ON, colorway GMK 9009
4. Push COMPILE button and wait
5. Push DL KEYMAP.JSON to save current layout
6. Push DL FIRMWARE to save the custom firmware

Note: X-Bows Nature supports up to 16 layers.

4. flash the firmware

1. Press Fn+Esc to switch keyboard in DFU mode (reset)

2. Flash firmware (from qmk_toolbox sources):

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sudo ./dfu-programmer atmega32u4 erase --force ; sleep 5
sudo ./dfu-programmer atmega32u4 flash --force layout.hex ; sleep 5
sudo ./dfu-programmer atmega32u4 reset