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Hi sorry for this being in English as I am from Canada, but here are some suggestions. I have the same controller and flashed via ST Link recently. It’s not clear how you powered it and where you connected the other 2 pins by the picture. Also, I used the 2 connectors near the center capacitor on the main board and had to scrape away the silicone. I also powered from the stlink to those 2 pins you are showing. So all 4 pins connected to the stlink. If you are using a separate power source, grounds need to be common. This info is all on this forum if you search.
