If your application firmware accidentally remaps the vector table, disables the debug clock (DBGMCU), or enters a low-power sleep mode before the debugger takes control, the target MCU is effectively deaf to your unlock tool.
Hold the physical reset button on your hardware, click "Unlock" or "Erase" in your software, and release the button a fraction of a second later. 2. Hardware Connection Instability writing flash programmer... fail unlock tool
The computer sees the device, but cannot send data packets correctly. Common Causes If your application firmware accidentally remaps the vector
Defeated, Alex leaned back in his chair and rubbed his tired eyes. He stared blankly at the wall, his mind racing with the implications of failure. All his research, all his effort, down the drain. disables the debug clock (DBGMCU)