Re:Downloading Master Code V5

You should be using V6 or V7 Master Code, unless you are having some sort of Issue with the newer Master Code.

Do you have the correct Com Port selected??
Are you using The USB to Serial adapter?? Do you know that is installed correctly?

If you have the Programming Cable connected to the Vex Controller, the Correct Com Port and have the IFI Terminal Open, when you Power Cycle the Vex Controller, you will see a message like “IFI>VEX - Master v6, User v20.01” on the Terminal Window.