To do that you must have root access or some powerful exploits to achieve your goal. This method is using memory access vulnerability to get root and then jailbreak the tv. i ported some parts of the other root thread even if some are not even needed. To jailbreak connect to your tv via prisoner user after uploading GetMeIn binary into it then :
disclaimer: root shell allows full unrestricted access to your tv’s linux os. this is very dangerous if you don’t know what you’re doing. i will not be responsible if you brick or otherwise harm your smart tv while following these instructions. you take all responsibility for your actions.

Rooting is the process by which users of Android devices can attain privileged control (known as root access) over various subsystems of the device, usually smartphones. Because Android is based on a modified version of the Linux kernel, rooting an Android device gives similar access to administrative ( superuser) permissions as on Linux or any

It targets a very wide range of devices including smart phones, tablets, in-vehicle infotainment devices, smart TVs, PCs, smart cameras, wearable computing, Blu-ray players, printers and smart home appliances. To understand the architecture and monitor the traffic that your Smart TV is sending you will have to connect your computer with Smart TV. Wait until the installation process is ready. Open Stump Root from your phone’s app drawer. In the main menu, tap on Grind. This will begin the rooting process. After the rooting is ready, your phone will ask for a reboot. Install SuperSU from the Play Store, in order to manage root permissions on the phone. - Press the right button and select yes to restart the TV. The presenter advises LG Smart TV users to agree to the user agreement, regardless of the service location. The presented solutions are easy to follow and should solve the problem. If the problem persists, viewers are encouraged to leave a comment for further assistance. qAOFNGs.
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    • how to jailbreak a lg smart tv