topic Re: rt1186 debug issues in MCX Microcontrollers

rt1186 debug issues

yanyanwang — Wed, 02 Sep 2026 11:09:31 GMT

After enabling OEM_CLOSE on the FRDM-IMXRT1186 development board, I can no longer debug the device. I saw in the reference manual that nxpdebugmbox can be used to re-enable debugging, but I tried it and was not successful.

yanyanwang_0-1788347257012.png

Re: rt1186 debug issues

marek-trmac — Wed, 02 Sep 2026 12:23:58 GMT

Hello @yanyanwang

In SEC tool documentation, you can find troubleshooting for debug authentication:

https://docs.mcuxpresso.nxp.com/secure/latest/09_troubleshooting.html#debug-authentication

Some useful tips can be also found in

https://docs.mcuxpresso.nxp.com/secure/latest/07_generic_workflows.html#debug-authentication-workflow

If this does not help, can you provide details about configuration? Could you share the SEC tool workspace settings?

Re: rt1186 debug issues

yanyanwang — Thu, 03 Sep 2026 02:55:25 GMT

I have reviewed the links you provided and followed the recommended procedure, but I am still experiencing the same issue.

I only signed the image and did not encrypt it. I also set OEM_CLOSE.

I am using nxpdebugmbox only to re-enable the debug functionality.

I have uploaded the SEC project as an attachment, along with the relevant logs. Could you please help analyze the project and logs and identify the cause of the issue?

Re: rt1186 debug issues

marek-trmac — Thu, 03 Sep 2026 14:20:48 GMT

@yanyanwang

It seems this problem is related to SEC 26.03. We recommend updating to SEC 26.06.

We are sorry for inconvenience.

Note: SEC 26.06 also contains fix for the SPARSE image format