Error: No STM32 target found!

[Vimal_M_A]

Im using Nucleo-H755 i have using this board for the last 3 months usually i get some Errors like no target found but i have solved those by viewing in the community chats but this Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication i have tried every thing i know and suggestions in the other posts like connect under reset , boot0 high , power down mode but i couldnt get it connected while connect the board  there is a file in the H755 storagenamed FAIL.txt in that this msg is present The interface firmware FAILED to reset/halt the target MCU is there any other way to flash the board 

[Andrew Neil]

What tool & version are you using to do the flashing - STM32CubeProgrammer?

Are you using the onboard ST-Link?

What does it show for the Target voltage?

https://community.st.com/t5/stm32-mcus-boards-and-hardware/failed-to-execute-mi-command-target-remote-localhost-61234/m-p/764370/highlight/true#M23571

[Vimal_M_A]

17:56:58 : ST-LINK SN : 001A003F3233511739363634
17:56:58 : ST-LINK FW : V3J15M7
17:56:58 : Board : NUCLEO-H755ZI-Q
17:56:58 : Voltage : 3.26V
17:56:58 : Error: Unable to get core ID
17:56:58 : Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication

[Andrew Neil]

Thanks.

What tool & version are you using to do the flashing - STM32CubeProgrammer?

[KnarfB]

Try STM32CubeProgrammer with Reset Mode Under Reset. This might help in cases where a bad firmware disconnectes the SWD debug interface or goes to some low-power modes soon *after* reset.

You may also play with the other settings, like reducing the speed. 

hth

KnarfB

[Vimal_M_A]

tried that also still not able to connect