  The astronomical applications greatly benefit from the knowledge of the
instrument PSF. We describe the PSF Reconstruction algorithm developed for the
LBT LUCI instrument assisted by the SOUL SCAO module. The reconstruction
procedure considers only synchronous wavefront sensor telemetry data and a few
asynchronous calibrations. We do not compute the Optical Transfer Function and
corresponding filters. We compute instead a temporal series of wavefront maps
and for each of these the corresponding instantaneous PSF. We tested the
algorithm both in laboratory arrangement and in the nighttime for different
SOUL configurations, adapting it to the guide star magnitudes and seeing
conditions. We nick-named it "BRUTE", Blind Reconstruction Using TElemetry,
also recalling the one-to-one approach, one slope-to one instantaneous PSF the
algorithm applies.
