How to disassemble and install the lock core of the security door by yourself?

First, remove the panel. There are two locking nails on the inner plate of the door lock. Remove the upper and lower screws of the inner panel and the inner handle panel, and then remove the lock cap and the outer handle. There is a screw in the middle of the baffle of the door lock body. Take out the lock core between the lock tongues, and you can take it out.