Crack ARM Base Microcontroller STM32F100C4 needs to disable the security fuse bit and then readout the firmware from its memory, which will provide the exactly same functions as original version:
This datasheet provides the ordering information and mechanical device characteristics of the STM32F100x4, STM32F100x6, STM32F100x8 and STM32F100xB value line microcontrollers just like the procedures of Attack IC Chip dsPIC30F4011. In the rest of the document, the STM32F100x4 and STM32F100x6 are referred to as low-density devices while the STM32F100x8 and STM32F100xB are identified as medium-density devices.
The STM32F100xx datasheet should be read in conjunction with the low- and medium- density STM32F100xx reference manual.
For information on programming, erasing and protection of the internal Flash memory please refer to the STM32F100xx Flash programming manual when Copy Microcontroller 8051 IC Silicon Laboratories C8051F340.
The reference and Flash programming manuals are both available from the STMicroelectronics website www.st.com.
For information on the Cortex™-M3 core please refer to the Cortex™-M3 Technical Reference Manual, available from the www.arm.com website at the following address:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0337e/.