I have been having a terrible time trying to flash my device. Got it to work once on my Win8.1 x64 using power from an ATX power supply, so I flashed it and all is fine with it.
Tried to help a friend flash his yesterday but could not connect to it. Tried my own again and it did not want to connect either.
Tested all USB ports
Tested on another Win7 x64 machine as well.
Finally connected it to an old XP x86 laptop and it works again. I can connect to mine now (Do not have the other one here).
I'm a bit insecure now though. When chosing "Target", the "STM32_Connectivity-Line_128k" is no longer there. Only these:
Which one should I use? Figured I might need to re-flash for an update so I might as well solve this now...