Hello, and thank you in advance for the help!
I have sunk quite a few hours into working with one of our club’s demo robots. We traded in all of our old keys for VexNET 2.0 keys, and I am in the process of setting up our classroom set. However, I have been encountering some issues.
The main issue is this: after being paired with a controller set, the robot then refuses to locate and pair remotely through VexNET keys. Both controller and core will blink yellow on VEX (which I assume means they are searching for each other), and then, after about 30 seconds, transition to a repeated pattern of two red blinks.
So far, I have tried the following: Powercycling, Updating RobotC, Re-installing the firmware on the Core, re-installing the firmware on the controller, downloading and running the two VexNET 2.0 update programming, installing a different program on the robot, changing key pairs, and changing the batteries.
So far, nothing has worked, and all I get to see is a little blinking red light at the end 
I would be grateful for any help that you could offer with this issue!
Thank you so much for your time and all you do to help the community!