If your FN Key is not working, please try the steps below:
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Make sure you haven't swapped the FN and Menu keycaps
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Reset the Keyboard to default settings
- GMMK Full Size - " FN + Esc then F1 + F3 +F5 "
- GMMK TKL - " FN + Esc then F1 + F3 +F5 "
- GMMK Compact - " Hold FN + R for 10 seconds"
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Try installing another switch from a key that works
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If nothing else works, get in touch with our CS here