Load Cell Calibration Challenges: Troubleshooting Parameters?

Hello, i'm trying to calibrate my load cell to get the right weight.. using rassbpery pi pico &i try it with arduino uno i've followed readme file of the library HX711 wich says start with no weight..than devide the raw value by the known weight to get scale factor But the result printed is always different(-/+)..even if i don't touch nothing, the weight the scale nothing... so how can i get the right paramater to pass to "set_scale()"? & How can I know if the load cell is damaged or no?