Soft Reset just reboots with a cleared out RAM/cache. It solves glitches. Minor hiccups and odd irritants.
[NOTE]Hold the Volume Down + Power buttons until the phone vibrates and reboots (about 10 seconds).
You do not loose data, your system memory is refreshed.[/NOTE]
Hard Reset reflashes your Phone with the last OS and Firmware stored in your recovery partition of Internal memory. This is the button push method.
[NOTE]Power off the phone > hold Volume Down > press Power > keep holding Volume Down until you see the exclamation (!) screen, then immediately release the Volume Down
Now tap Volume Up / Volume Down / Power / Volume Down
You should see the spinning gears and your phone will reflash the last OS version held in recovery. You do loose data, but get your phone back. Sign into your Microsoft Account and restore your backup during the set up.[/NOTE]
Most often on these forums they talk only of Soft and Hard Resets... Many use Hard Reset to mean the button push method
or the software method. I believe this muddies the waters. I think that the software method should have the traditional name given on other platforms,
Factory Reset. This also reflashes your Phone with the last OS and Firmware stored in your recovery partition of Internal memory.
[NOTE]
Settings > System > About > Reset your phone[/NOTE]
I have no direct evidence, just an instinctual feeling that Factory Reset is not as hard on your phone as a Hard Reset. If you do a Factory Reset (software method), the system can prep itself preparatory to flashing from recovery. If you do a Hard Reset (button push method), the phone has no warning and it is more like suddenly shifting the transmission of a car while the engine is revving. IMHO, Factory Reset is preferable then to Hard Reset and the button push method should not be your go to, but be reserved for those times your phone is unresponsive.
See also:
http://forums.windowscentral.com/ge...set-types-uses.html?highlight=soft+hard+reset
I'm suggesting a Factory Reset (software method) as WDRT will not deliver you 10, only 8.1 ATM.