STM32U5 encountering error DEV_TARGET_NOT_HALTED.

[Gaurangthaker]

Hi All,

I have two questions:
1. Does the STM32U5 microcontroller support reversible RDP Level 2?

2. I have attached the steps we followed - it appears that RDP Level 2 is being unlocked, but afterward we are encountering a DEV_TARGET_NOT_HALTED.

Could someone please review the steps and helps us resolve the issue?

[Imen.D]

Hello @Gaurangthaker ,

Make sure to update the STLink version.

Please follow the steps and recommendation described in this article : How to regress from RDP level 2 to RDP level 0 on the STM32U5 series

[Gaurangthaker]

Hi @Imen.D 

We have followed the same procedure and thoroughly reviewed each step. Additionally, my ST-Link firmware is up to date. Please let me know if there are any other steps I should follow to resolve the issue.

[Imen.D]

Did you try Connect Under Reset mode?

Refer to AN5347 and check the steps described in section '7 Readout protection (RDP) when TrustZone enabled'.