That KK2 board is getting pretty dated. The gyros are old school piezo and it uses an ATMega168 which is too small for the newer firmware. That's why Seeed has it on closeout.
I think the KK2 wont work for a V22, because I can mix elevator, aileron, pitch and rudder linearly only, but the signals for the rudder and aileron actuators depend on the angle of the nacelles and small-angle approximation wouldn't be valid.
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