How do i hack into a device without the devices'' password?
You use a weakness in the device or the password mechanism.
It would depend what you are trying to "hack". If it is an OS like win xp and you have forgotten your password, you can get a tool on a floppy drive to unlock it.
We do not condone hacking of anything illegal such as WEP or to break into peoples accounts etc. Please provide the situation and if it is a legitimate reason to hack then Im sure someone will be able to help.