I finally made a Pimoroni HyperPixel 4.0 capacity display work in a Raspberry PI 2B with Volumio (at nowadays version 2.729). It has a 800x480 resolution.
The thing is that in Classic View, the screen is slightly (but very slightly) too big and a scroll bar is displayed at the right side.
What is the resolution of the GUI? How could I adjust it to 800x480, so everything is displayed without any scroll bar?