There are TWO different Firmware update instructions for this setup. One is for the RM's firmware, the other is for the Dante Card firmware.
You MUST register your Dante Card to a Registered Mixer in your account. The first time this is done, there should have been a notice to follow instructions for Dante Firmware, as Presonus supplies the DNT firmware file for the update (via Option Card's product details in your account). Audinate supplies the Software for this process. Without this, the Dante is NOT configured properly and will not have proper channel names in Dante Controller and may not have any output signal as well.
After registering your card, follow the instructions to update your card from the Card's product detail page.
RM Mixer Firmware Update Instructions (USB Drive) Link
Dante Overview Article
KB Article: Why is there no Audio from my Dante Card?