Hi Oleg, Unico tool is compatible only with STEVAL-MKI109V3 Professional MEMS and related daughter boards. The other demo tool for ST MEMS sensors is the Unicleo-GUI that can run on STM32 Nucleo board with the expansions of the X-NUCLEO-IKS01Ax family.
To test LSM303DLHC on STM32F3DISCOVERY hardware you should download the Discovery F3 libraries and run the examples. I know it is not so straightforward as with Unico or Unicleo GUIs... regards
