Which Sharp ROM? I use 2.38 and have never seen a device manager.
Have you tried simply restarting the usbd0 connection after plugging power in?
Command would be something like:
ifconfig usbd0 192.168.129.201 netmask 255.255.255.0 up
Also, are you sure that 192.168.129.201 is the right IP? I still get very confused about figuring out the right one, but maybe somebody else can help who knows more.
Meanwhile, try the above ifconfig command, and right after that, try your ifconfig -a
sdjf