SC20 EVb camera issue

Hi All,
We are working on SC20 Smart EVb. Downloaded SC20 android source code, build images and flashed.
Message “Can’t connect to camera” popup while opening Camera. Can anyone guide me to resolve this issue?

I wonder if you can test the EVb with official firmware?
if camera can work properly and you sure you build images with quectel’s SDK, maybe you EVb has broken.