There is a coffee machine that runs on busybox FS UBIFS OS. Close all ports. The coffee machine can be updated. The update file contains the ubifs image
https://drive.google.com/file/d/1p-_zGbGVT4ee5rYpBCRbRboX7SuqKhbW/view?usp=drive_link. If you make changes to the image, replace the password hash and open port 22, I think access will be open, and you can install additional applications for work (VNC, etc.).
Who knows and has already worked with this, if it’s not difficult, you can get any advice)))
Thank You!