Python script to get a /bin/sh shell on Xiaomi Mi 360 Home Security Camera 2K via UART serial port. It has only be tested on model MJSXJ09CM.
It interrupts the U-Boot boot sequence to get an U-Boot shell and modify the bootargs to execute /bin/sh instead of linuxrc, which is the script that configures the camera. When the shell is ready, it executes linuxrc in the background so that the camera can be used as usual while the shell is still active.
Here is a photo of the UART port in the camera:
