This upgrade changes any existing Bifrost or Bifrost Uber into Bifrost Multibit*, a radically different DAC using the medical/military grade AD5547 D/A converter and Schiits proprietary closed-form, time- and frequency-domain optimized digital filter. For this upgrade, your Bifrost needs to have its motherboard firmware updated by us. This requires a specific programming device with an RJ12 connector, as well as software. Because of this, there is no self-install option, sorry.
*Your Bifrost will need to come back to Addicted to Audio Melbourne via registered and insured post.