One recent hack to get around this is called NAND Mirroring, where if you have physical access to the computer, you can attach wires to the device's memory chip and make a perfect copy of its contents.
最近出现一种攻破方法叫 "NAND 镜像",如果能物理接触到电脑,可以往内存上接几根线,复制整个内存。