Device protection

[andrea64]

When trying to flash the NRF Bootloader via OpenOCD, i got this error from command line:

nRF52 device has a CTRL-AP dedicated to recover the device from AP lock.
A high level adapter (like a ST-Link) you are currently using cannot access
the CTRL-AP so 'nrf52_recover' command will not work.
Do not enable UICR APPROTECT.

How can i do to remove the protection?

Thank you.

[Håkon Alseth]

Hi,

 

If openocd does not have updated functionality on performing a recovery, I would recommend that you obtain a JLink debugger.

If you have a nRF5-series DK, you can use this kit as a debugger/programmer for external boards.

 

Kind regards,

Håkon

[johnnagardner]

Hello,

To remove the protection and successfully flash the NRF Bootloader via OpenOCD, you need to follow these steps:

1. Disable the UICR APPROTECT:

• Locate the UICR (User Information Configuration Registers) section in your code or configuration files.
• Find the entry related to "APPROTECT" or "UICR->APPROTECT" and set its value to 0 or disable it.

2.Save the changes and rebuild your code or configuration files to ensure the updated settings are applied.

3. Connect a low-level adapter:

• Since a high-level adapter like the ST-Link cannot access the CTRL-AP (Control Access Port) required for device recovery, you need to use a low-level adapter that supports it. Examples of such adapters include J-Link and Segger.
• Connect the low-level adapter to your NRF52 device, ensuring proper connections and compatibility.

4. Use the 'nrf52_recover' command:

• With the low-level adapter successfully connected, you can now use the 'nrf52_recover' command to remove the protection and recover the device from AP lock.
• Execute the command via the OpenOCD command line or the relevant interface specific to your adapter.

[Adeatimeng]

Same question!