[Ale77]

@anhdung88 I’m happy you have resolved! 🙂

[Ale77]

I had the same problem some days ago. The error is due to the fact that the OpenOCD doesn’t accept the hla_serial in ASCII characters. The serial number must be specified in hexadecimal format. I summarized how I resolved the issue in the following post:

http://www.carminenoviello.com/mastering-stm32/forums/t/issue-while-debugging-two-nucleo-boards-simultaneously/

[Ale77]

Just a note: I was using two plain St-Link V2 connected to two custom boards, not two Nucleo boards. Maybe there is a difference?

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