Problem with connection STM32H745

[DBrau.2]

I've made a mistake and programmed to STM32h745 dual core processor program which was created to STM32H743 with one core. Now I have a problem with connection and ST-Link doesn't recognize device. What can I do with that?

I've also tried to supply board under reset (NRST pulled down to GND) and I get the fail "The interface firmware FAILED to reset/halt the target MCU".

[Uwe Bonnes]

You should leave the STLINK to handle the NRST line. Check only the box in Stm32CubeProg.

[DBrau.2]

In STM32CubeProg problem is exactly the same. No connection to the target

[Tesla DeLorean · Accepted solution]

https://community.st.com/s/question/0D50X0000BRZL5NSQX/nucleoh745-stlink-utility-can-not-connect-to-target

Going to need to strap BOOT0 HIGH, and POWER CYCLE the board several times, until you can connect and delete your code.

[DBrau.2]

Thank you a lot. That was what I was looking for. Now the STM32 connects normally