Unlike miniDSP's processors (like the 2x4 HD or Flex units), which have complex DSP (Digital Signal Processing) chips that require regular firmware updates to add features or fix bugs, the UMIK-1 is a much simpler beast. It does not run a complex operating system.
miniDSP explicitly states that the UMIK-1 is not designed for end-user firmware updates in the traditional sense. Unlike a graphics card or a router, you should not regularly check for UMIK-1 firmware upgrades. umik-1 firmware