We’re sorry that you have encountered this issue. To help resolve this issue, first we will force the Robot Brain into firmware update mode, so we can reinstall the current firmware.
Please first remove and then reinsert the Robot Battery, then disconnect all Smart Motors, sensors, and radio from the Robot Brain. Then press and hold both the Up and Down buttons at the same time while pressing the Check button to turn on the Robot Brain. This will force the Robot Brain into Device Firmware Update mode.
If your Robot Brain displays the following text, you can now connect it to your computer and reinstall the current firmware:
VEX Robotics Inc. DFU
Connect to PC for
If you do not see the above text on your Robot Brain screen, or if you have any additional questions or concerns, please contact VEX Technical Support at firstname.lastname@example.org or by emailing +1-903-453-0802 so we can provide more detailed help to resolve this issue.