Recover STM32F042K4 Locked Microprocessor Firmware

Recover STM32F042K4 Locked Microprocessor Firmware from its flash memory, after breaking stm32f042k4 microcontroller readout protection, and flash data can be replicated from stm32f042k4 mcu chip;

The device has the following features:

• 6 Kbytes of embedded SRAM accessed (read/write) at CPU clock speed with 0 wait states and featuring embedded parity checking with exception generation for fail-critical applications.
  • The non-volatile memory is divided into two arrays:
    • 16 to 32 Kbytes of embedded Flash memory for programs and data
    • Option bytes

The option bytes are used to write-protect the memory (with 4 KB granularity) and/or readout-protect the whole memory with the following options:

• Level 0: no readout protection
  • Level 1: memory readout protection, the Flash memory cannot be read from or written to if either debug features are connected or boot in RAM is selected
  • Level 2: chip readout protection, debug features (Cortex®-M0 serial wire) and boot in RAM selection disabled

At startup, the boot pin and boot selector option bits are used to select one of the three boot options:

• boot from User Flash memory
  • boot from System Memory
  • boot from embedded SRAM

The boot pin is shared with the standard GPIO and can be disabled through the boot selector option bits. The boot loader is located in System Memory. It is used to reprogram the Flash memory by using USART on pins PA14/PA15, or PA9/PA10 or I²C on pins PB6/PB7 or through the USB DFU interface.