The LG Smart Refrigerator features two ways to gain privileges

Either soldering the eMMC flash or connecting to UART pinout allows rooting this system’s Android setup. This method requires copying over a stock Android launcher, but nonetheless, the Android install can be “unlocked” on this device.

https://www.youtube.com/watch?v=WXfQMlofuw8

https://www.exploitee.rs/index.php/LG_Smart_Refrigerator_(LFX31995ST)