is we need to give 3v3 supply even though we give power by usb when flashing @msfujino
Please show me a photo of the STLink you’re using and its documentation.
You mentioned using an original STLinkv2, but from the photo, it appears to be a Chinese clone.
The function of the 3.3V pin differs between the original and the clone. On the original, it’s an input pin that senses the target’s power supply voltage. On the clone I use, it’s an output pin that can also supply 3.3V to the target.
So, which STLink are you using?
Judging from the photo, I believe it has the same functionality as STLink I’m using. Therefore, you don’t need to connect anything to the 3V3 pin.
If you want to try it, you can also stop powering it from USB and instead power the 3V3 pin from STLink’s 3.3V output.