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Disable FSD

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Hypothetical fictional story: AI takes over and alters software to take over Model Y completely. Is it possible to disable the FSD while in the car like pulling a plug somewhere from inside the car and continue to manually drive the car after pulling plug? Assume all normal software overrides like pressing brake have been overridden when the AI re-wrote the software to overtake the car.
I have another answer to your question...

Hypothetical climax of the fictional story:

Our hero sits trapped in a now AI controlled vehicle doing 150 mph down the highway, unable to stop the car, open the doors, or anything (we don't know WHY the AI had a beef against our hero--I'll let the OP fill in those details).

Meanwhile back at hero HQ we see a 17 year old former hacker now turned secret government agency employee as some kind of prison release deal sitting in front of about 15 screens including a giant glass see through screen, madly swiping things left and right. She hacks into Tesla's Dojo (which is obviously connected to the internet) using one of those password breaker programs that fills in the password one letter at a time. As the boss and the head security agent look on behind her, she declares "I'm in". Within 10 seconds she has the AI "program" up on her screen. She starts scrolling through the code (and if you pause and zoom in here, you will see that the section of code she is written in csh and is doing something along the lines of listing files in a directory and printing the file names to the screen) and ten seconds later she says she has found a back door, but it will take her five minutes to exploit it.

Which is good because now we can cut back to the car scene and we see our hero continue to fiddle with the car trying to get anything to work. About all he succeeds in doing is getting the windshield wipers to stop operating despite the fact that it's a perfectly clear day. "Finally fixed it!" he exclaims! As the vehicle swerves left and right avoiding slower traffic with some amazing action including a perfectly executed 360, we see an overhead sign above saying that there is a detour three miles ahead due to a parade that is taking place right on the road ahead (for some reason they have parades on highways in this city).

We cut back to control room where the boss is screaming at the hacker, because that always helps. She's go the fix all ready now and just needs to upload it to the car. Unlike breaking into the server and fixing the code, this is an agonizingly long process that is demarcated by a slowly advancing progress bar. We cut back to the hero's vehicle that has now crashed through the Road Closed barrier and is now within sight of the local high school marching band just ahead in the middle of the street.

Back to the control room, and just as the upload progress bar hits 98%, it suddenly turns red and says "Connection broken". Long silent pause.

We cut back to the vehicle, and we see that the car's battery has run out and the car rolls to a stop just feet away from all the screaming and panicking kids and parade goers.
 
I have another answer to your question...

Hypothetical climax of the fictional story:

Our hero sits trapped in a now AI controlled vehicle doing 150 mph down the highway, unable to stop the car, open the doors, or anything (we don't know WHY the AI had a beef against our hero--I'll let the OP fill in those details).

Meanwhile back at hero HQ we see a 17 year old former hacker now turned secret government agency employee as some kind of prison release deal sitting in front of about 15 screens including a giant glass see through screen, madly swiping things left and right. She hacks into Tesla's Dojo (which is obviously connected to the internet) using one of those password breaker programs that fills in the password one letter at a time. As the boss and the head security agent look on behind her, she declares "I'm in". Within 10 seconds she has the AI "program" up on her screen. She starts scrolling through the code (and if you pause and zoom in here, you will see that the section of code she is written in csh and is doing something along the lines of listing files in a directory and printing the file names to the screen) and ten seconds later she says she has found a back door, but it will take her five minutes to exploit it.

Which is good because now we can cut back to the car scene and we see our hero continue to fiddle with the car trying to get anything to work. About all he succeeds in doing is getting the windshield wipers to stop operating despite the fact that it's a perfectly clear day. "Finally fixed it!" he exclaims! As the vehicle swerves left and right avoiding slower traffic with some amazing action including a perfectly executed 360, we see an overhead sign above saying that there is a detour three miles ahead due to a parade that is taking place right on the road ahead (for some reason they have parades on highways in this city).

We cut back to control room where the boss is screaming at the hacker, because that always helps. She's go the fix all ready now and just needs to upload it to the car. Unlike breaking into the server and fixing the code, this is an agonizingly long process that is demarcated by a slowly advancing progress bar. We cut back to the hero's vehicle that has now crashed through the Road Closed barrier and is now within sight of the local high school marching band just ahead in the middle of the street.

Back to the control room, and just as the upload progress bar hits 98%, it suddenly turns red and says "Connection broken". Long silent pause.

We cut back to the vehicle, and we see that the car's battery has run out and the car rolls to a stop just feet away from all the screaming and panicking kids and parade goers.
A simpler, more believable ending:

While speeding down the road at 150 MPH, the AI software suddenly has a fit of phantom braking, slamming on the brakes and careening to a near stop. Our hero, seeing his chance, uses the emergency mechanical door release to pop open the driver's door and roll out of the car just before the car recovers and speeds off.
 
A simpler, more believable ending:

While speeding down the road at 150 MPH, the AI software suddenly has a fit of phantom braking, slamming on the brakes and careening to a near stop. Our hero, seeing his chance, uses the emergency mechanical door release to pop open the driver's door and roll out of the car just before a full self driving semi roars over the top of it at 240 mph and vanishes down the road. . . . . (while "Over The Waves" plays in the background.)
Suggested edit. . . .