Modifying Board Manager

I am currently trying to modify the STΜicroelectronics Board Mangager to get it to support my Nucleo 64 F334R8T6.
But for some reasons my modifications don't show up in the Arduino IDE.
I am modifying the Board Manager in the Folder AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.3.0 .
Is the IDE somehow caching the Board Managers?

Yes, I hit this working on the Teensy boards as well.

There is an open Issue on it:
changes to boards.txt are not picked up · Issue #1030 · arduino/arduino-ide (github.com)

One of the postings in the issue, shows a work around for this which involves deleting the Arduino cache.

Thank you, that workaround solved my problem.

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