This is a Frame Challenge
Sensory organs don't need to be programed to sense, nor do legs need to be programed walk, or hands to grasp; their functionality is encoded by genes.
You're confusing various aspects of computer construction. Suggesting that eyes need not be trained to see is like suggesting that a computer doesn't need a graphics card to operate.1 It's true that no amount of programming will connect a graphics card, and (from the perspective of our metaphor) once connected, programming is "no longer required" to see the pretty picture on the screen.2
So, let's get our metaphors straight.
The existence of an eyeball is like a graphics card in a computer.
The ability for the brain to "see" using the eye ball is more like the BIOS component that allows a computer to comprehend the presence of the graphics card.
The ability to appreciate anything painted by Picasso is software.
Which is why we humans have the phrase, "an acquired taste."
There are a great many things our body can do with "BIOS." It can pump blood, breathe, blink, grasp, possibly even walk.3 But there are an infinite number of things that the human body (and brain) must be trained to do. Like riding a bicycle and mathematics. Indeed, the term "muscle memory" reflects the "software" (training) required to do something the body isn't simply "preprogrammed" to do.
How does this relate to hacking?
Traditional computer hacking means changing the software so it does something it wasn't intended to do. This may or may not be desirable (generally, it's always undesirable to somebody). But the human body can be hacked.
Theoretically, the genetics can be hacked to change how any aspect of the body performs. For example, you could change DNA such that a newborn would have ultraviolet spectrum sight. This would be similar to changing the graphics card.
Biologically, an existing brain could be physically altered to change how it interfaces with the body. Simplistically, the brain could be changed to blind the person. This would be similar to messing about with BIOS.4
Programmatically neurons & synapses could be modified to change how someone thinks about something, how they'd react to a situation, even the language they speak. This would be the equivalent of hacking software.
And we already have a word for it: brainwashing.
1 Well, true, computers don't require a graphics card to operate, but if a human wants to play World of Warcraft it's required. Stay with me, this'll all make sense.
2 This makes a lot more sense if you're old enough to remember how the Apple I computer worked.
3 My jury's out on this one, BTW. I'd never want to test the theory, but I'd be curious to know if a baby, left completely alone (not even animals) and having no stimulus or reason to stand would nevertheless stand and walk. Maybe, but there isn't enough credible proof to simply make the claim, IMO.
4 and anybody who's bricked a computer because they messed up a BIOS update knows that's a place where angels fear to tread.