topic Re: How to factory reset LPC55S06 in LPC Microcontrollers

How to factory reset LPC55S06

Aurelien_Grange — Mon, 30 May 2022 09:49:07 GMT

Hi,

I have some issues using LPC55S06-EVK for SECURE-BOOT and SBKEK/USERKEK AES Keys.

Secure Boot is enable, SWD is disable and can only be enable using Secure Debug but I have some issue with nxpdebugmbox auth and with internal Key (USERKEK, SBKEK).

PFR region is not sealed.

How can I reconfigure the dev kit as it come from factory ? ( i know tha cfpa version should be increment each time).

For exemple, I want to disable secure boot and remove all key/allocation code.

Thanks for your help.

Re: How to factory reset LPC55S06

diego_charles — Wed, 01 Jun 2022 19:39:51 GMT

Hi @Aurelien_Grange

I hope you are doing well!

I am afraid that there we do not have a method to restore the chip's PFR ( for example ,restore CMPA and CPFA) as the chip comes from factory.

Generally speaking, if the PFR section is not sealed, you may try to restore several fields but there is a very high risk of bricking your part.

Are you able to show us your errors with Debug mailbox and the procedure you followed ? So we can try to determine the issue.

Let me know if there is any other question you may have.

All the best,

Diego.

Re: How to factory reset LPC55S06

diego_charles — Wed, 01 Jun 2022 19:40:37 GMT

Hi @Aurelien_Grange

I hope you are doing well!

I am afraid that there we do not have a method to restore the chip's PFR ( for example ,restore CMPA and CPFA) as the chip comes from factory.

Generally speaking, if the PFR section is not sealed, you may try to restore several fields but there is a very high risk of bricking your part.

Are you able to show us your errors with Debug mailbox and the procedure you followed ? So we can try to determine the issue.

Let me know if there is any other question you may have.

All the best,

Diego.

Re: How to factory reset LPC55S06

Aurelien_Grange — Tue, 07 Jun 2022 06:37:36 GMT

Hi,

I try to use MCUXpresso Secure Provisioning to come back in unsigned mode .

All command success (send empty CMPA, erase flash , and send binary) but since I can't connect with blhost, nxpdebugmbox and SWD is still not accessible.

The CMPA /CFAP used looks like that :

Re: How to factory reset LPC55S06

Aurelien_Grange — Tue, 07 Jun 2022 06:37:58 GMT

Re: How to factory reset LPC55S06

Aurelien_Grange — Tue, 07 Jun 2022 06:42:03 GMT

I have already brick 6 dev kit. Can you give me the way to disable secure boot and come back in unsigned mode.

Thanks

Re: How to factory reset LPC55S06

Aurelien_Grange — Tue, 07 Jun 2022 07:34:22 GMT

Hi,

I try to use MCUXpresso Secure Provisioning to come back in unsigned mode .

All command success (send empty CMPA, erase flash , and send binary) but since I can't connect with blhost, nxpdebugmbox and SWD is still not accessible.

The CMPA /CFAP is those i previously send

Re: How to factory reset LPC55S06

Aurelien_Grange — Thu, 09 Jun 2022 11:41:36 GMT

What are CFPA and CMPA to send to come back in non-secure mode?

Re: How to factory reset LPC55S06

diego_charles — Tue, 21 Jun 2022 16:03:33 GMT

Hi @Aurelien_Grange

I hope you are doing well.

You can try to set the MCU to boot plain images again using below settings on the elftosb gui. This is only in the CMPA.

However, for this we need to have ISP enabled.

All the best,

Diego.

Re: How to factory reset LPC55S06

Aurelien_Grange — Thu, 23 Jun 2022 09:45:18 GMT

Hi, I can't download elftosb-gui, Download stop after begin (I don't know if problem is from my side ir from your server side). So I canot test it for know.

Re: How to factory reset LPC55S06

diego_charles — Wed, 29 Jun 2022 04:17:53 GMT

Hi @Aurelien_Grange

Did you continued to have issues obtaining the tool? Or where you able to recover any of your parts?

Diego