I have a Xiaomi MI3 running an Android 6.0 CyanogenMod version. I want to return to use a MIUI Rom, but I don't know how save all the contacts (a lot of them aren't saved on the google account, they are saved on the phone).
What I have to do to save all the contacts (in order to have them when I'll install the MIUI Rom)?
Usually, I use TeamWin TWRP Recovery to install Roms.