In order to hard reset a Karbonn A9, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Karbonn A9 device will be brought back to the default configuration of a brand new device.
1. For starters, power down the device.
2. Now remove the battery and put it back in.
3. Continue by pressing and holding the Power & Volume Up buttons for a moment.
4. Select the wipe data/factory reset option. Use Volume buttons to scroll and Power button to select.
5. Using the same method as above, select Yes, delete all user data.
7. The hard reset process is complete. Congratulations.