In order to hard reset a Karbonn A2, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Karbonn A2 device will be brought back to the default configuration of a brand new device.
1. Hi. First of all, switch the phone off by holding down the Power button.
2. Take out the phone's battery. After few seconds pass, put it back in.
3. Next thing to do is to hold down the Power and Volume Up buttons for a few seconds.
4. Using Volume buttons to scroll and Power button to select, select the wipe data/factory reset option. Confirm with a press of the Power button.
6. Next, select the Yes - delete all user data option.
7. Good job, you have completed the hard reset process.