New variant for STM32L431CB

[mamanbudiman]

Hello All,

I am trying to add a new variant for STM32L431CB, based on this guide
https://www.instructables.com/Arduino-IDE-Creating-Custom-Boards/
but still failed.

Is there any hint or web-link to add a new variant to the arduino-STM32L4 ?

Regards,
Maman