Karbonn k9 smart 4g baseband unknown

Karbonn K9 smart 4g after flash baseband unknown.
Any solution? Already flashed with two firmwares

Karbonn_K9_Smart_4G_Mintoak_MT6737M_V12_20180208

Karbonn_K9_Smart_4G_Indus_V07_MT6737M_6.0