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After trying to Disable Trustzone, no longer able to connect to micro

GaneshS
Associate

I am trying to disable TrustZone on my MCU - STM32U5 and i followed the steps as per the instructions given here :

https://community.st.com/t5/stm32-mcus/how-to-disable-trustzone-on-stm32u5-series/ta-p/49793

After I uncheck the TZEN option byte, I no longer can connect to the micro 

I get the following error:-

GaneshS_0-1702566283199.png

Kindly help 

3 REPLIES 3
Imen.D
ST Employee

Hello @GaneshS and welcome to the Community :)

Did you try with the latest version of CubeProgrammer?

I recommend you following the detailed steps mentioned in the "​9 TrustZone deactivation" section of the AN5347 Arm TrustZone features for STM32L5 and STM32U5 Series application note.

Imen

When your question is answered, please close this topic by clicking "Accept as Solution".
Thanks
Imen

Hello I replicated the steps as given in the app note . I am using the latest version of the programmer ie . 2.15 

Tried logging through the CLI

GaneshS_0-1702589424940.png

Does not let me read/write option bytes. What am i missing ? 

Christian N
ST Employee

Hello GaneshS ,

Thank you for contacting STMicroelectronics. Your inquiry is being escalated for specialized support.

Kind Regards,

Christian

ST Support