If the millet phone displays the activated device, it means that the phone has been bound to an account, and you need to unbind the account before you can brush the phone. The way to unbind the account is to find \"Account and sync\" in the phone Settings, select the corresponding account, and click \"Log out\".
Then you can download and install the refresh package, enter the recovery mode for refresh operation. Be careful to back up important data. Caution is required because there are risks associated with swiping.
The phone opens the USB debugging connect to the computer and then the computer downloads and installs an application treasure, open the toolbox inside the toolbox, you can see that there is a mobile phone brush function, open the ROM that is suitable for your phone one click brush on the line