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# Put a getty on the serial port
ttyAM0::respawn:/sbin/getty -L ttyAM0 115200 vt100 # GENERIC_SERIAL
I have good luck with a cheap $2 USB to TTL Serial Console USB to COM Cable module Cable from ebay that has a Black, Green, White, and Red wire. The Red on mine is USB power which I don't use because my Wink is already powered when I'm using it. Black=GND, Green=RX, White=TX, Red=N/C.
Connecting via 115200 baud N81 works well for me.
Plug in power while connected, you should see some text no matter what firmware your wink has or if the serial is enabled or not. If you wait for a message saying the hub is ready, hit <ENTER>, you should get a prompt. If you don't, the /etc/inittab line above is probably commented out and there's really no way to interact via the serial console... maybe try SSH? or you may be at 00.47 (not prompting for an update) or 00.55 (current) and stuck at the moment.