Drone can'T take off

Hello, we have a h copter drone. For some reason, when we go above 50 percent from the controller, it does not power after a point and I guess that’s why the drone can’t take off. I don’t know if it’s software or engine related.

You will need to provide a lot more information that that. What components do you have (Flight Controller, ESC’s, battery power, motors). What’s the take-off-weight (with battery). And post your parameter file here and/or a link to a .bin flight log of a take-off attempt.