i need help in alt hold

i am  using

Hobbyking X650F Glass Fiber Quadcopter Frame 550mm

and

apm2.5

Propeller EPP 10X3.8

EPP1038C

 

ESC 30A (Speed Controller for Brushless Motor)

FESC-001

Bumble Bee Brushless Motor -920 KV/210 W (Designed
for Quadcopter)

i have a problem in althold the

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