My wife dropped and cracked the screen on her S2 so we want to sell it as is but don't want to sell until we have factory reset the phone.

Only issue is the screen doesn't work so this can't be done the traditional way.

When we turn phone on, we can hear it start up so everything there is OK.

From what i can tell, it can't be done via Kies and there isn't any other way to do it?

Any help would be appreciated.