Your thinking wrong. Theres two sides to the array, the computer side that computes your senses and the brain side. The brain is the hardware and the computer side is the software. Viruses dont physically damage hardware, just software. Your desktop gets a critical virus and you can wipe it clean and reinstall your OS. All your hardware is undamaged though.

So if a virus infected this muli-electrode array, we would cut off the pipeline from the computer to the brain, wipe the computer, reinstalled you calibrations, reconnect pipeline. Now all you have is 'memory' of a virus that attacked you and you can recognize it now and defend against it in the future.

Anyways why do you guys seem opposed to this? Its a good thing for the human race.