S32K116 is locked while Flash Erase using CSEC. How to unlock it? Is there any tool?

[muhammetkalayci]

Hello,

my MCU is locked while flash erasing due to secured flash memory in CSEC operations.

I found out the problem but now I want to unlock my MCU. 

Is there any way unlocking it? hard resetting? maybe NXP has a tool for that?

(I cannot connect not debugging, nor j-flash)

I am open to any solution.

[muhammetkalayci]

Hello, 

I have tried both of them. In the first one, there was a power connection issue. 

As a result, they did not solve the issue.

@Senlent Now, I want to ask if there is not any way to unlock mcu; I need a clear guide for erasing flash that will not lock again any chance.

Because this is 3rd mcu that is locked and I dont have much in backup. 

Please provide me a clear and solid guideline. 

Thank you,

Sincerely.

[Senlent]

Hi@muhammetkalayci

you can take a look at the AN12130,

https://www.nxp.com/docs/en/application-note/AN12130.pdf 

The chapter:3.2.5.2 Mass erase and CSEc considerations 

In order for you to better understand these modules, you can also take a look at the following two documents

Using the Kinetis Security and Flash Protection Features 

Getting Started with CSEc Security Module 

These are some application notes I could find, maybe they can help you

[Senlent]

Hi@muhammetkalayci

1.please try to use J-LINK to read the register of MDM_AP 

for example:

According to AN4507 :https://www.nxp.com/search?keyword=AN4507&start=0 

"If  the user disables mass erase with no other means to unsecure the device (no backdoor key and no firmware means of changing the default security options), then that device will be permanently secured."

2.If your J-Link can not connect to MCU, you can have a try to use the software provided in the below link.

Bricking and Recovering FRDM-KL25Z Boards: Reset, SWD Clock and Low Power

https://mcuoneclipse.com/2013/06/16/bricking-and-recovering-frdm-kl25z-boards-reset-swd-clock-and-lo...