You can not update firmware of the entire DGX H100 motherboard tray with a single command. You must update the components individually.
You can not update firmware of the individual components of the DGX H100 GPU tray. For example, you can not individually update the firmware for the GPU only. You must update the firmware by flashing the entire DGX H100 GPU tray.
Firmware download is not automatic. You must download the firmware manually from the NVIDIA Enterprise Support Portal.
nvfwupdcommand-line utility that is shown in sample commands is not automatically installed as part of NVIDIA DGX OS and runs on the Linux operating system only. You must download the utility from the NVIDIA Enterprise Support Portal.