Karbonn A37 Hard Reset

Hard Reset:

• Press and Hold Volume Down + Power key
• Release power key but keep hold Volume Down key for 10 sec.
• Now you see recovery menu.
• select wipe data / factory reset and select yes.
• now reboot device

Karbonn A34 Hard Reset

Hard Reset:

• Press and Hold Volume UP + Power key
• Now you see Android Logo
• Now touch Home Key to see Recovery Menu
• select wipe data/factory reset with volume down and touch Menu key to confirm
• now select Yes -- Delete all user data and touch Menu key to Confirm
• now reboot device
• hard reset done

Hard Reset method 2:

• Press and hold Volume Down + Power key
• Now a Menu Appear
• select Clear eMMC with Volume down and press Power key to confirm
• hard reset done

Karbonn A30 Hard Reset

Hard Reset:

• Press and Hold Volume UP + Home + Power key.
• you see recovery options.
• select wipe data / factory reset and select yes.
• now reboot device.

Karbonn A3 Hard Reset

Hard Reset:

• Power On Handset and connect to pc or laptop
• Download Android Tool and Drivers
• Install both drivers "SCI android drivers" and "ADB Android Drivers"
• Now open tool and press "5" and hit Enter Key to wipe data / factory reset.
• after format handset restart automatic
• hard reset done

Karbonn A27 Hard Reset

Hard Reset:

• Press and hold Power key + Volume UP + Volume Down to get recovery mode.
• if this method not work then try 2 second method
• 2nd method: press power key
• after vibrate phone press and hold volume UP + volume Down
• you see recovery menu.
• select wipe data / factory reset and select yes.
• now reboot device

One another method is here:

• Power On Handset and connect to pc or laptop
• Download Android Multi tool and Drivers from Here
• Install both drivers "SCI android drivers" and "ADB Android Drivers"
• Now open tool and press "5" and hit Enter Key to wipe data / factory reset.
• after format handset restart automatic
• hard reset done

Karbonn A21 Hard Reset

Hard Reset:

• Press and hold VOLUME UP + POWER KEY
• now you see green screen don't release volume up key
• after 10 seconds you see red screen, now release Volume up key.
• now you see recovery options.
• select wipe data with factory reset and press power key for 2 sec.
• now select yes and press power key for 2 second.
• now reboot device.

Karbonn A2 Plus Hard Reset

Hard Reset:

• Press and Hold Volume Up + Power Key.
• You see a menu.
• Now Press Home Key to See Recovery Options
• Now Select Wipe data/factory reset and touch Enter Key to Confirm
• Now Select Yes -- Delete all user data and touch Enter Key to Confirm.
• Now Reboot your Device.