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ST link v2-1 can connect with nucleo but v2 cannot connect to target .

Kmk.16
Associate

hi

I have some of nucleo boards(F446ZE, F303RE and stlinkv2) for the test before make the board.

A weeks ago, I uploaded skecth files by arduino IDE with st-link v2.

(I saw st-link v2 doesn't have VCP, but it works with COM port when i just plug st-link v2. i think because I tried the debugger BMP(couldnt use full name...) before. )

It worked nicely, but It doesn't work now.

so I have tried several methods and confirmed that the connection is possible using stlink v2-1 of another nucleo board.(connect 3 wire: GND, SWDIO, SWCLK)

​stlink v2-1 can connect with arduino IDE(COM) and STM32 ST-LINK Utility. but STLINK V2 doesn't work even when i connect by ST-LINK Utility and TrueStudio.

I dont know why, just do I need to throw away ST-LINK V2?

and I have worried about the board that i will make will not connect with debugger.

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