SPM9645 DSMX does not work on SnapDragon

I connected spektrum receiver SPM9645 DSMX into J15 port on SnapDragon board, but the receiver value didn’t show up on QGroundControl.

I read this thread RC not working on snapdragon flight since I am facing the same problem
The solution was removing blsp.config file on the adsp.
However, I do not have blsp.config file on /usr/share/data/adsp/ at the beginning, so I couldn’t solve this.

Does anyone know how to solve this issue?