Level 2: no debug
In this level, the protection level 1 is guaranteed. In addition, the CortexM0 debug capabilities are disabled. Consequently, the debug port (SWD), the boot from RAM (boot RAM mode) and the boot from System memory (boot loader mode) are no more available.
In user execution mode, all operations are allowed on the Main Flash memory. On the contrary, only read and program operations can be performed on the option byte. Option byte are not accessible for erase operations.
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没法恢复，这个是永久的，不可逆的，开启后就再也没法通过JTAG仿真，没法通过片外Flash或RAM启动，很多功能都永久失效了，送到ST原厂也没办法
F0手册里没有提到二级加密不能擦写。
Level 2: no debug
In this level, the protection level 1 is guaranteed. In addition, the CortexM0 debug capabilities are disabled. Consequently, the debug port (SWD), the boot from RAM (boot RAM mode) and the boot from System memory (boot loader mode) are no more available.
In user execution mode, all operations are allowed on the Main Flash memory. On the contrary, only read and program operations can be performed on the option byte. Option byte are not accessible for erase operations.
不可逆操作
小老弟，操作选项字节就可以了。
看Flash那一块。加密芯片。
F407的手册也是这样写的，但是开启二级加密后，Flash就没法擦写了。
没开启二级加密前，模拟EEPROM是正常的
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