No Network Interface on Raspberry Pi

[agent_kith]

agent_kith, I use it on pi4 few days ago, it’s pretty easy to use, and it gave me a bigger soundstage and detail. Really thanks to share this wonderful OS and support!

It's my pleasure

As my existing power supply only have 2.1A...do you have any suggest which is better then official power supply?

Yeah, about that, IMO it's worth the effort to get the 3.1A (or better) PSU. Mainly because the Pi4 is pretty power hungry. There will be undervoltage if add anything like a USB mouse/keyboard, or even a HDMI output.

Some other tweaks worth considering:
* Different brand and rating of microSD cards
* Underclocking? (Or overclocking).
* Offload the OS to a SSD

At the moment with my development Pi, I am using overclocking and OS offload to SSD. Havn't have the logistics to do this for music listening yet due to the current world situation.
* Linear PSU