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B-U585I-IOT02A gives "Error: ST-LINK error (DEV_TARGET_NOT_HALTED)" after flashing TFM example

Associate III


I have a B-U585I-IOT02A board and was trying out the TFM Application example from STM32Cube_FW_U5_V1.2.0.

After flashing the firmware as instructed, I could successfully run the test application. However, after re-connecting the board, I now get "Error: ST-LINK error (DEV_TARGET_NOT_HALTED)" and am unable to use the device.

I wonder what is causing this behaviour? and how can I unlock the device?

Many thanks,

Mohamed Aymen HZAMI
ST Employee

Hello @amos3​ and welcome to the community,

You can change the boot system to avoid execute the current program by setting the BOOT0 pin, like that you can recover your chip.

note: after setting BOOT0/PH3, do a power on reset and then try to connect again.

Mohamed Aymen