Updating Vex V5 Controller Firmware

I get a red screen with an image on my controller basically saying to update the controller, but it won’t update when I plug it into port 21 on the brain. Any ideas?

Have you tried first pressing the reset button on the back of the controller? It’s inside the middle hole on the backside of the controller. You’ll just need an allen wrench or something long/narrow enough to press it.

Ya. I reset it then plugged it into the brain port 21 and it still doesn’t work

Any other ideas?