The Fixed mode ( = 2) requires user to manually enter the receiver position $PQTMCFGSVIN,W,2,0,0,<ECEF_X>,<ECEF_Y>,<ECEF_Z>*cksum coordinates.
$PQTMCFGSVIN,W,2,0,0,<ECEF_X>,<ECEF_Y>,<ECEF_Z>*cksum
…the manual has misunderstanding example.