JS mobile back camera wrong resolution

I got an android phone with 2 cameras, It has different resolutions at FRONT CAM and different resolutions at BACK CAM. I need to force the phone of using the BACK CAM which I achieve successfuly! The issue is, everytime I run the code, It get's only the resolutions available of FRONT CAM, and strangely access BACK CAM with the resolution got form FRONT CAM!

const hdConstraints = {
    video: {
        //Mobile device function
        width: { min: 3260 }, //3264 is the width of FRONT CAM
        facingMode: { exact: "environment" }

        //PC device function
        // width: { min: 1280 },
        // facingMode: { exact: "user" }
    }
}

The dimension width: { min: 3260 } is from front cam, if I put any of BACK CAM resolutions into the width property, it just don't recognize it at all! I could not find any code to force the width of watching at BACK CAM's resolutions!