If got a problem with my copter since if updated the firmware. Before I updated the firmware everything worked perfectly. Since if updated the firmware the copter, when I raise the throttle all motors start to spin just fine. As I raise the throttle to mid or full throttle the motors just spin a bit faster and the copter doesn't even lift off. I already tried to downgrade to an older firmware but the problem stays the same. The parameters for the maximum motor throttle is set to 1000.
My configuration is:
Ardupilot Mega 2.5
Motor: Turnigy Multistar 2814-700Kv 14Pole Multi-Rotor Outrunner
ESC: Turnigy Multistar 30 Amp Multi-rotor Brushless ESC 2-4S