Hi @gvolt,
the script is that,
this is the content of /boot/config.txt
initramfs volumio.initrd
gpu_mem=32
max_usb_current=1
dtparam=audio=on
audio_pwm_mode=2
dtparam=i2c_arm=on
disable_splash=1
hdmi_force_hotplug=1
and /boot/userconfig.txt
volumio@volumio:~$ gpu_mem=32
volumio@volumio:~$ max_usb_current=1
volumio@volumio:~$ dtparam=audio=on
volumio@volumio:~$ audio_pwm_mode=2
volumio@volumio:~$ dtparam=i2c_arm=on
volumio@volumio:~$ disable_splash=1
volumio@volumio:~$ hdmi_force_hotplug=1
volumio@volumio:~$ cat /boot/userconfig.txt
Add your custom config.txt options to this file, which will be preserved during updates
dtparam=spi=on
dtoverlay=waveshare35b-v2-overlay
dtoverlay=waveshare35b-v2-overlay
Regards
Edoardo