@NiLuJe: Thank you for prompt update as usual
I tried USBNet-0.22, but it doesn't work well under the following circumstance:
Restart after renaming DISABLED_auto to "auto" on Kindle3
WIFI=true, SSHD_ONLY=false in /mnt/us/usbnet/etc/config
telnet/ssh works well
To switch back to usb mode, I hit ;debgubOn and ~usbNetwork without usb plug cable
But K3 doesn't switch to usb mode after usb cable plugged.
Something wrong with my setting? or this is normal?