Now this is something unheared of???
You mean you had no security code on before, and you bashed your phone to floor and somehow it got activated??

I am afraid if that happened so it must be something else, possibly uncorrectable by SW fix or device flashing... It might be that you damaged something inside the phone so that some pins on chips are either shorted or disconnected, thus the device thinks it's security locked.

With this, the only fix is to deliver to Nokia Care, where they will propably notice they cannot do anything about it. --> it's broken beyond any repair