Arduino Nano to APM2.6

Hello everyone, first post here.

I am trying to control the FlightModes with Arduino using a potentiometer by giving a PWM signal to CH5 of the APM2.6 @488 Hz. So it works fine up to here. Here is the simple Code

void setup()
{

TCCR1B = TCCR1B & 0b11111

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