LynnL4

> @andryblack it seems that macOS have some weird issue with USB CDC generally. I was forced to reduce CDC buffer sizes to get anything to work at all during...

HI，As far as I know, the 6.x kernel has been upgraded with a lan78xx driver that supports 1000M, by default. https://github.com/Seeed-Studio/seeed-linux-dtoverlays/issues/59