Booting from usb is something you need to set in the BIOS.
Volumio supports legacy and uefi boot out-of-the-box, but sometimes the bios settings may need extra attention.
Please do not modify any Volumio system parameters (especially grub or syslinux.cfg), this won’t help and you will loose them with the very first Volumio update anyway.
Don’t know what a “mini86” is, there are hundreds of mini x86 pc’s around.
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