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Hmm all standalone Emulators functioned very well with rumble, but the RetroArch builds with mgba core don't functioned, patched and unpatched. Do you have any suggestions?

You can try setting the controller driver to 'xinput' in Retroarch.

Sorry no. I have tested your gbg-build and stable retroarch builds. No rumble. Do you know if your Windows-Emu-Build must 100% rumble? Have you tested the gbg-build with rumble?