phone collected Accelerometer calibration error

[Prithiv2807]

1. i tried to apply the accelerometer calibration code to already collected data but the accelerometer calibration calculated values are always in bias, not in scale so i changed the vals range 0.01 to -0.01 now some values are coming in scale but still it is throwing error .
2. if you know what is the imu range for mobile phone imu sensor vals range I have set 0.01 to -0.01 and collected 6 different position separately (+x, -x, +y, -y, +z, -z). after changing the vals limit 0.01 still it is not calculating.
3. The medium link mentions fused method combining kf & madgwick filter outputs to get the orientation values. but in github link it is not there. Where can I find it?
   awaiting for your valuable response.