Fixing STM32 of pixracer

Hi, I got a pixracer and the had to replace the STM32 chip as the previous one spoiled. I have soldered everything and it’s all good. However, I don’t know what to flash and make it work. Any help would be appreciated. Thanks

Take a look at this
https://discuss.ardupilot.org/t/pixracer-dfu-needed/19353

@ppoirier Thanks a lot.