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The following steps describe how to check the firmware version of Calyx Femto & DAC 24/192 in OS-X
 
1. Choose the 'About This Mac' in the Apple logo
2. Click 'More Info...'
3. Move 'Content' -> 'Hardware' -> 'USB'
4. Move 'USB Device Tree' -> 'USB High-Speed Bus' -> 'Calyx USB Audio 2.0'
5. Check the firmware version
  - The firmware version is 3.1.1 in the picture