My KK5.5 had same problem, When I tried it first, every thing except pitch angle movements where working flawless, so thought the pitch gyro, is not working, but when I again flashed with same firmware (xcopter 4.7 by kaptain kuk), the pitch problem solved but then came the Lazy motor, problem
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Infact, I have two of these KK5.5 , which I couldn't make to work
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