my father last time bought a second hand nokia e90..
and now he forgot the security code..

and while the phone has jz run out of battery..
so even if my father recharge the battery and on the phone..
he dunno the lock code..

anybody can help?

You need to take the phone to NCP and they'll reflash it. This is the only way.

sorry for my noobness...
wat NCP stand for and what is their address...?

NCP stand for Nokia Care Point....First of all is your E90 original...if not then send your phone to a phone shop(maybe you should try at ampang park near mcdonals)...it only cost RM 50 to unlock your phone....

try the default password and see 0123 if fail then try backup your phone and reflash the firmware with pcsuite then just restore back the stuff you backup