ST_LINK is not detecting STM32H755

[poojaT]

We have received new STM32H755ZI-Q board recently from STM, When we connect try to flash through STMCubeIde ST_link is not detecting and saying target not found.

but in device manager the device is showing. below is error snippet

Error in final launch sequence: Failed to start GDB server Failed to start GDB server Error in initializing ST-LINK device. Reason: (4) No device found on target.

[mƎALLEm]

Hello @poojaT and welcome to the ST community,

1- "STM32H755ZI-Q board recently from STM" what board? NUCLEO-H755?

2- You need to check if your USB cable is a data cable and not a charging cable.

3- Did you try to connect to chip using CubeProgrammer?

4- Did the connection worked at first time and it is no more working?

if yes, what is the power configuration you set? SMPS or LDO? if you are using NUCLEO-H755 you need to set SMPS otherwise you set the wrong power supply. See this article: How can I recover my STM32H7/STM32H7RS board after facing a power configuration deadlock?

[poojaT]

1- "STM32H755ZI-Q board recently from STM" what board? NUCLEO-H755?

Ans:  NUCLEO-H755-ZI-Q

2- You need to check if your USB cable is a data cable and not a charging cable.

its USB cable

3- Did you try to connect to chip using CubeProgrammer?

Yes tried 

4- Did the connection worked at first time and it is no more working?

no its not worked only.

Tried with configuring HSE clock, and changing clock configuration which has provided in community

Tried to configure BOOT0 pin it's not enabled to configuring. tried remove and add ST-LINK jumpers.

suggest solution for this? its newly arrived board,

[mƎALLEm]

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@poojaT wrote:

3- Did you try to connect to chip using CubeProgrammer?

Yes tried 

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What was the result?

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@poojaT wrote:

4- Did the connection worked at first time and it is no more working?

no its not worked only.

Sorry I didn't understand this statement. Do you mean it didn't work at all?