Problems for make my first flight

[deibiz1982]

Hello,

I am sure i am doing something bad, but unfortunatelly dont know what :,(.
I have my drone completly mounted, but when the flight is going to begin, my drone make a flip and the flight stops in the floor.

1) i can see in the pc application that all the sensors are giving right values.
2) i have calibrated the ESC

I am sure i am doing bad something so simple, but dont know what.
Any help? Any Sugestion?

Best regards!

[fly4fun6719]

May be a silly question but have you put the props in their correct positions?