ARM Cortex-M chips (STM32, LPC, Kinetis) have RDP levels. If RDP Level 1 or 2 is active:
Flash programmers rely on "Algorithms" or "Flashloader" files (.flm, .elf, etc.) that tell the tool how to access the specific memory map of the MCU. writing flash programmer... fail unlock tool
Many SoCs (e.g., Allwinner, Rockchip, Qualcomm) require specific boot pins (BOOT0/BOOT1) to be set to System Memory (ROM bootloader) before connecting. If you are in Main Flash boot mode and the flash contains garbage, the CPU hangs immediately, causing the programmer write to time out. ARM Cortex-M chips (STM32, LPC, Kinetis) have RDP levels
| Fail symptom | Possible cause | Tool fix | |-----------------------------|------------------------------------|--------------------------------------------| | “Chip is read protected” | RDP level 1 or 2 | Send debug unlock command via JTAG/SWD | | “Flash erase timeout” | Block locked by firmware | Send global unlock (0xAA 0x55 ...) sequence| | “Device not responding” | Bus conflict or wrong CS pin | Add reset pulse before init | | “Verification failed at 0x0”| Bootloader blocks first sector | Use secondary boot entry (e.g., DFU mode) | Many SoCs (e