We cannot download the program to the Cortex. We have tried all troubleshooting measures. These parts have been swapped for known working parts - Cortex, Serial Link, Primary Remote, Keys, and added a backup battery. Current Error message with Cortex directly connected to the computer is: “Failed to verify the serial link is connected to a robot controller. Cannot communicate with VEX Cortex Slave CPU. Master CPU communication is working.”
All batteries are freshly charged. Please help!! Tournament is in a few hours.
Additional error: Flash write failure. File in robot is corrupted needs to be downloaded again.