To update your Astral-HH firmware:
1. Insert a micro SD card in the Astral-HH. Micro SD card is not included.
2. Format the micro SD card. See Settings > System > Format.
3. Connect the Astral-HH to the computer for file transfer using a USB-C cable.
4. Download the Astral-HH firmware PRG file from:
https://www.sounddevices.com/download/?prod=Astral-HH
5. Copy the PRG file to the root of the Astral-HH micro SD card
6. Eject the Astral-HH from the computer.