The blinking light indicates a problem with the electric shift. The number of blinks indicates what component circuit is out of specification. In this case six blinks indicates a problem with the internal circuit of the ECU. Since the ECU is a sealed electrical part there is no way to repair it other than to replace it.
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Below is a link to a parts diagram for your atv. The ECU is the Electronic Control Unit for the electronic shift system. There is also an ECU for the ignition system. The parts diagram calls it a control unit, change and it is part #9 on the diagram. The part is under the front fender mounted to a cross brace on the frame with a rubber vibration insulator. The ignition control unit is mounted next to it so be sure you get the correct part.