1377
Researchers jailbreak a Tesla to get free in-car feature upgrades
(techcrunch.com)
This is a most excellent place for technology news and articles.
If you read the article it is different. This relies on physically bringing connections to gain root access to the file system.
It's also unlikely Tesla can't just watch for modified files and update them everytime the car goes into drive or something. They probably won't do it, but to claim it's impossible is just disingenuous