I am using STM32F303CCT6 on my own board. During testing I noticed that USB DFU works fine and is detected by the PC, but ONLY when the ST-LINK/V2 is also connected ... When it is not connected the DFU does not show up on my PC?
I performed a sanity check and my code runs as expected without the ST-LINK/V2 connected, its just that the USB DFU is not found be the PC without it ...
Any suggestions or things to check?