Arduino for STM32

I got the solution in the Arduino Forum. It was a bug with the caching of the Arduino IDE. Because of that changes in boards.txt weren't loaded in the IDE. Workaround in the Arduino IDE Issue: https://github.com/arduino/arduino-ide/issues/1030 Arduino Forum Thread: https://forum.arduino.cc/t/modifyi...

I am currently trying to implement the Nucleo64-STM32F334R8T6 as replacement for my broken F030R8T6. I have followed the guide Add a new variant on the wiki. But no matter what I try, I can't get it to show up in the Arduino IDE. Has someone an idea what I am missing? Link to my fork: https://github...