stm32n657 how to unlock the protection program?

[yzf]

When using stm32cubeprogrammer to burn the program for nucleo-N657X0, the external flash kernel is locked. The inside of the external flash I read is all ffffff. When I erase the code of the external flash, it will report an error that it cannot be erased.

 

  

[Julian E.]

Hello @yzf,

Here are some similar post I found for other MCUs:

• Solved: Warning: The core is locked up - STMicroelectronics Community
• STM32H563 Warning: The Core is locked up - STMicroelectronics Community
• Solved: Core Locked Up - STMicroelectronics Community
• Solved: Core is locked up after programming option bytes w... - STMicroelectronics Community
• Solved: STM32CubeProgrammer "Warning: The core is locked u... - STMicroelectronics Community

If it does not help, let me know and I will transfer this to the STM32 MCUs Products - STMicroelectronics Community.
I think they know better.

Have a good day,

Julian

[yzf]

I have tried all the methods but still haven't found an effective solution to the problem. Now I suspect that it might be a problem with the solder joints. Could you please forward this message to others for their opinions?