Help quick

My vex net keys wont connect I need help because I have a competition coming and up and they won’t connect they will connect for 5 second then the vexnet and game led flash twice about every second I have replaced the battery on the cortex and controller and it still dose this .

We’re sorry to hear you’re having difficulties. Please make sure your firmware is up to date on the Cortex, VEXnet Joystick, and VEXnet 2.0 keys using the Firmware Update Utilities. If you are still having difficulties, please contact customer support by calling +1-903-453-0802 or emailing