adb – What is Android OS in context of Chrome OS?

What kind of operating system is Android? I’ve tried using other file types, but not any of them work: .ios, .img, .exe, .pkg.

My terminal needs a password which is chromeos-setdevpasswd. Yet, when I use it with sudo sh, it times out and resets its own pass.

As I know, I have to take out the data strips screw to stop it from timing out. I don’t know if that’s why I can’t use certain commands because I’ve already been to root status in crosh.