In order to hard reset a Hisense Sero 7 Pro, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Hisense Sero 7 Pro device will be brought back to the default configuration of a brand new device.
1. Turn off the device.
2. Press & hold the Volume Up and Power buttons. Release them after the Hisense /Android logo/Recovery Mode/Boot Mode appears on-screen.
3. Press and hold the Power button until Recovery Mode opens.
4. Using Volume and Power buttons, select the wipe data/factory reset option.
5. Now choose Yes.
6. And now choose reboot system now.
7. Voila, done.