Doubt About Root Access

[Drenghist]

Hi all,
I am a new Xiaomi user, I just bought a mi4c.
I have the last developer rom installed, but i have a doubt with the root access.
When I enter security settings, the root access seems to be abled, because i can see it (despite of the first rom the mobile had), but when I try to run an app like titanium backup, it doesn't have permission and I cannot give them! They just don't appear on the root menu.

If i have to flash something else, please give me a clue because I am a bit lost

 

[Drenghist]

I just solved it., i will write it for anyone with the same issue.
Root access in Mi4c is not working properly. You need to install su.zip (I don't remember where to get it), and it's solved!