Wipe user data and reset nubia Z18s to factory settings.
Before resetting to factory settings, it is recommended to remember the login and password from your Google account or delete your Google account if you are going to sell your phone. In this way, you will avoid problems with the Factory Reset Protection function, which asks for a password for a Google account.

Before factory reset, follow these steps.

1. Charge your phone battery to at least 70%.
2. Copy your contacts, photos and user data to a flash drive or PC.
3. Logout from your Google Account.

nubia Z18s - Erase All Content and Settings

1. From the main menu, select Settings.
2. Find and select General management menu.
3. Scroll down and tap Reset.