Because the AD-16x and DA-16x can operate in a Standard Routing mode or Advanced Routing mode, a different firmware version is provided for each mode.

http://www.apogeedigital.com/support/legacy-product-support#x-firewire

In Standard Routing mode:
– AD-16x: You will need the firmware labeled AD-16X (Mac or WinXP). This firmware will offer…

  • 16 channels of analog input
  • 2 channels of digital output
  • Sample rates from 44.1 – 96 kHz.

– DA-16x: You will need the firmware labeled DA-16X (Mac or WinXP). This firmware will offer…

  • 2 channels of digital input
  • 16 channels of analog output
  • Sample rates from 44.1 – 96 kHz.

In Advanced Routing mode:
– For both AD-16x & DA-16x, you will need the firmware labeled DD-16X (Mac or WinXP). This firmware provides…

  • 16 channels of input (analog for AD-16x, digital for DA-16x)
  • 16 channels of output (digital for AD-16x, analog for DA-16x)
  • Sample rates limited to 44.1 kHz or 48 kHz.

On a Mac, the Firmware Updater application is included with the firmware file download. If you have Windows XP, you’ll need to download the updater application separately (download here).

Instructions for performing the update are included in the ReadMe pdf file that comes with the firmware file download.

NOTE: The update can only be installed via a Mac system running OSX 10.6.7 or ealier, or a computer running Windows XP SP2 or ealier. See the X-Firewire FAQ article for more detailed information.