The Rigol VS5000 series is not recognize by the rigol-ds firmware driver. I included it in the udev rules. As see before: ATTRS{idVendor}=="0400", ATTRS{idProduct}=="03e8", MODE="664",GROUP"plugdev". Nor sigrok-cli -d rigol-ds --show does not see VS5000 series. If any more info needed, please respond.
The USB protocol used by the VS5000 is not implemented yet. You can use it via the Ethernet connection. *** This bug has been marked as a duplicate of bug 208 ***