But i heard hard reset can be perform by power and volumekeys combination. What u say is a soft reset..
I may be wrong, correct me...
Posted via the Windows Central App for Android
Soft Reset:
Hold Power and Volume Down together for 5-10 seconds. The phone should vibrate and reboot. This should not affect your settings, messages, photos, contacts, etc. This function simply reboots your phone without forcing you to do a backup,
Hard Reset:
If your phone is unresponsive and you can't reach Settings, you may be able to reset your phone using the hardware buttons.
Press and hold the Volume down and Power buttons at the same time until you feel a vibration (about 5–10 seconds).
When you feel the vibration, release the buttons, and then immediately press and hold the Volume down button until you see a large exclamation mark.
Once the exclamation mark appears, press the following four buttons in this order: Volume up, Volume down, Power, Volume down. Your phone should now reset and restart itself. (It might take a while for the reset to finish.).
The same result can be achieved on a working phone by using the Settings -> System -> About -> Reset my phone method.