problem while connecting stlink v-2(isol) and stm32f103c8

[Elango]

Hi Everyone,I'm unable to connect to my STM32F103c8 board using an ST-Link/v2(isol).

I connected the cables as mentioned in ST-Link/v2 manual:

PIN1  (VAPP)      -> VDD
PIN7  (TMS_SWDIO) -> SWIO
PIN9  (TCK_SWCLK) -> SWCLK
PIN20 (GND)       -> GND

Here is the physical connection,after connecting VAPP to vdd target is not powered on 

i attached the image below (connection bw debugger and target.jpg) while giving external supply using st link v2 clone it displays target not connected  the connection was(target_on.jpg) 

in log trace it shows

ST-Link/V2 device detected
Target voltage detected: 3.072181
Error getting target IDCODE: if SWD, check SWD connection
Error (4) while initializing ST-Link in SWD mode

software settings and log messages are attached below(setttings.jpg)

[ONadr.1 · Accepted solution]

Try to press the reset button and release it just before the connection is established. If the connection succeeds, it is advisable to perform a mass erase.

The MCU on these boards is usually counterfeit and ST-Link then refuses to connect to it.

[AScha.3]

Try using the stm32CubeProgrammer -> https://www.st.com/en/development-tools/stm32cubeprog.html

(if not "find" your ST-Link/V2 , try older version, maybe 2.8.0 )

then show, what its telling...

+ check on your "blue pill" board: is there a STM... chip or CK or other manufacturer "F103" .

[Elango]

Hi sir,thank you for your suggestion now it works fine