About device recovery and disabling protection

Hello.

I started using a custom board with the nRF5340.
After flashing the program, it seems that protection was enabled, and operations such as erase, read, and write became impossible.
Recovery also failed.

  • Is the recovery procedure correct?
    The commands and results are as follows:
    Net Core
    Command Line

    Full Log


    App Core
    Command Line

    Full Log


  • Is the flashing procedure correct?
    I pressed the Flash button in VS Code.
    Should I use J-Flash (Lite)?
  • Please tell me the procedure to disable the protection.

Until now, I have mainly used the nRF5340DK along with nRF Connect for Desktop / VS Code.
As I am not familiar with handling custom boards and J-Link, I appreciate your understanding.

Thanks for reading.

a.da

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