FAULTY GYROSCOPE

Shortly after the battery issue was solved, the gyroscope stopped responding to the Arduino flight controlled. Because of this, the whole startup procedure, which includes taking readings from the gyro and calibrating it for flight, did not work. After using some diagnosis programs I figured the gyro is busted, and everything else (transmitter/receiver, Arduino board, battery, motors and ESCs) worked fine, so I ordered a new one and I will have to wait until it arrives.