@ophub I've tried your latest build for S905X2 (2G+16G, Realtek card), and got both ethernet and wifi working from USB after using the dtb file from balbes150 (5.7.8)
Armbian_22.02.0_Aml_s905x3_focal_5.4.175_2022.01.30.0137.img.gz

Here is the detail log:
http://ix.io/3NXY

Here are updates board photos:

But the log related to the network adapter is showed continuously. I'm not sure how to disable this log.

By the way, I just confused that you said Realtek has no driver under Armbian but it seems working now with balbes150's dtb.
#47 (comment)
S905x3 dtb file from balbes150's image:
https://www.dropbox.com/s/d83yqv69tkjvias/meson-sm1-sei610_578.dtb?dl=0

Could you give me any suggestions for this board?

Thank you.