I using a board STM32l412 Nucleo 64 and I would like to use its ST-Link to load a firmware in other MCU (external application) , but the ST-Link does not connect to the other board. The hardware connection is ok.

[FDigi]

Is there some software configuration to do this procedure?

Thanks

[Uwe Bonnes]

How did you test the hardware connection if the ST-Link does not connect?

Did you try "connect under reset"

Is the target IO-Voltage 3.3 VolT? If less, Debugger will not recognize the level.

Can you test with another debugger?

Di you see signal on the connection with a scope?

[FDigi]

How did you test the hardware connection if the ST-Link does not connect?

I mean the wiring connection.

Did you try "connect under reset"

Not yet.

Is the target IO-Voltage 3.3 VolT?

Yes.

Can you test with another debugger?

I can connect with J-Link.

Di you see signal on the connection with a scope?

Not yet.

[Tesla DeLorean]

You have a common ground?

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Most often it is that the design you connect too is nonfunctional.

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Check you have VDDA connected.

Check part orientation.

Check level on NRST.

Check voltages and capacitors on VCAP pin(s)​

[FDigi]

I can connect to design with J-Link.

[Mike_ST]

If not already done, you have to remove jumpers on CN2 and JP4.

It is recommended to update the ST-Link firmware as well.

[FDigi]

Yes, jumpers removed.