I have one of the brains that keeps searching for its controller, but they cannot connect. I have checked for software downloads and everything is up to date. I have removed the blue radios and put them back in. They were able to connect earlier in the school year, but not now.
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The first thing that I would like to check is your firmware. Please attach a screenshot of your VEXos Firmware Updater as everything is connected to the brain.
If you do not have VEXos installed in your PC, here is a video that walks you through the installation process: https://www.youtube.com/watch?v=4Ti89ErD3VI&index=15&list=PLvvcc7S26YEgp60fNJwh64aj9ywiZ79Ta