CubeProgrammer + ST-LINK V2 doesn't work anymore

[paraschivescue]

I have created a firmware for a STM32L010F4Px microcontroller.
I was able to Connect and Download Firmware by using ST-LINK V2.

For some reason, I can't connect to the MCU at the moment by using CubeProgrammer + ST-LINK V2.

Instead, I can connect/debug my microcontroller by using a SEGGER J-Link Ultra+ + J-Flash tool.
The log from CubeProgrammer doesn't give me much details:

13:28:34 : UR connection mode is defined with the HWrst reset mode
13:28:34 : ST-LINK SN : 37FF71064E573436D2C11443
13:28:34 : ST-LINK FW : V2J47S7
13:28:34 : Board : --
13:28:34 : Voltage : 3.28V
13:28:34 : Error: Unable to get core ID
13:28:34 : Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication

[AScha.3]

Try in CubeProgrammer with reset : software   setting.

[paraschivescue]

I have tried all options including Software Reset but without any success:
13:26:09 : STM32CubeProgrammer API v2.22.0 | Windows-64Bits
13:26:35 : UR connection mode is defined with the SWrst reset mode
13:26:35 : ST-LINK SN : 37FF71064E573436D2C11443
13:26:35 : ST-LINK FW : V2J47S7
13:26:35 : Board : --
13:26:35 : Voltage : 3.28V
13:26:35 : Error: Unable to get core ID
13:26:35 : Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication

[Andrew Neil]

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@paraschivescue wrote:

I was able to Connect and Download Firmware by using ST-LINK V2.

For some reason, I can't connect to the MCU at the moment by using CubeProgrammer + ST-LINK V2.

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So what changed?

• Something in your firmware ?
• Something in your hardware setup ?
• Tool update(s) ?
• Other ?

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@paraschivescue wrote:

Instead, I can connect/debug my microcontroller by using a SEGGER J-Link Ultra+ + J-Flash tool.
The log from CubeProgrammer doesn't give me much details:

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Is that using the exact same cable & connections ?

Is it a genuine ST-Link ?

How to recognize a genuine ST-LINK/V2 versus a cloned one

Can it connect to any other target(s) ?

[mƎALLEm]

@paraschivescue ,

Any low power used in the application you've already uploaded?

Look at this post. Use "Power down" mode.

[paraschivescue · Accepted solution]

I have solved the mystery.
The problem was a wire that was no longer making good contact between ST-LINK v2 debugger and my development board on which the microcontroller is soldered.
Thank you all for your involvement and help! 
Have a good day!