Joystick and Microcontroller not pairing

Our Grade 7 class had being doing Vex for 3 years, using 7 robots.
This year,one robot is having problems with VexNet.
We are able to pair the joystick and Cortex using the orange usb cable.
However, when we use the WiFi USB keys, we cannot pair joystick and Cortex.
We updated the firmware in the Cortex and Joystick, replaced batteries.
We have replaced everything except the Cortex with no success.

We are using Black WiFi USB ‘keys’. Does the firmware in them have to be updated ?

Hi Joe,

The VEXnet Keys 1.0 cannot be programmed.
If you would like to send them back to us for analysis please contact support@vex.com

Regards.

-Eli