Hello everyone,
I am trying to implement SBSFU (Secure Boot Secure Firmware Update) on NUCLEO-G474RE using STM32CubeExpansion_SBSFU_V2.7.0.
Initially, everything was working fine and I was able to program the board normally.
What I did
I followed the SBSFU documentation and examples.
While configuring SBSFU, I modified Option Bytes, specifically Write Protection (WRP) addresses to match the SBSFU memory layout.
After applying the option bytes, the problem started.
Current problem
Now I cannot program or erase the MCU anymore.
I get the following errors:
1.In STM32CubeIDE
'Launching SBSFU (1)' has encountered a problem.
Failed to execute MI command:
load ...\SBSFU.elf
Error finishing flash operation
2. In STM32CubeProgrammer
Full chip erase fails
Mass erase fails with error:
Error: Mass erase operation failed. Please verify flash protection
3.I also tried:
Full chip erase
Erase selected sectors
Hardware reset / power cycle
“Under reset” connection mode
Factory reset via STM32CubeProgrammer
→ All fail with flash protection–related errors.
Option Bytes status
RDP = AA (Level 0)
PCROP and WRP were modified for SBSFU
After this change, the device seems to be locked and refuses erase/program operations
Board information
Board: NUCLEO-G474RE
MCU: STM32G474RE
Toolchain:
STM32CubeIDE
STM32CubeProgrammer
ST-LINK (on-board)
OS: Windows
Question
Is it possible that I permanently locked the flash by misconfiguring WRP / PCROP while setting up SBSFU?
Is there any recovery method to fully unlock or erase the MCU?
Is there a recommended safe procedure for changing Option Bytes when using SBSFU to avoid this situation?
I want to implement SBSFU in stm32, is there have any documentation?
Any advice or recovery steps would be greatly appreciated.
Thank you very much.
