Security researcher Sick Codes demonstrated running the video game Doom on the display of a John Deere 4240 tractor at the Def Con hacking conference in Las Vegas. He and Doom modder Skelegant jailbroken the tractor’s Linux system and displayed the game as a transparent overlay on the tractor’s user interface. The modified Doom was set in a corn field where the player drives a tractor to mow down enemies. The jailbreak process took several months and required low‑level access to the tractor’s operating system. Sick Codes also developed a new exploit that provided root access by soldering controllers directly to the circuit board, according to Wired. He said the vulnerability could be used to create a tool that simplifies repairs for independent mechanics, a capability that John Deere has restricted in the past. He obtained 1.5 GB of diagnostic logs that dealers could use to identify problems. Earlier in the year, John Deere remotely locked equipment after thefts in Ukraine and after compliance requests in China, prompting a March announcement to make its software available to independent repair shops.