The steps to install onto the Sunmi V2 device is all on my github; https://github.com/dafish7/Sunmi-v2-Firmware-
Firmware Files and Patch image; https://drive.google.com/file/d/1YtjlVHd1im9Kfo24Zq3Hr-jJpD7gjRkz/view?usp=share_link