Carson X4 Quadrocopter Micro FPV Instruction Manual page 38

Forward flip
Pull the joystick to the back and then quickly push the joystick to the
front and release the stick to the center after the flip.
G
Backward flip
Push the joystick to the front and then quickly pull the joystick to the
back and release the stick to the center after the flip.
In Expert Mode, the X4 can fly at high speeds and do flips. if you don't
need it to flip, you can select anti-flip mode. Press the throttle stick to
select or deselect anti-flip.
38
OFF = one TX beep = it can't flip.
ON = two TX beeps = It can do flips.
Note that when the X4 runs out of lipo power, it also can't flip.