USB-TTL Serial Bridge with CP2102
it's for 2,3€ (included shipping) available on ebay.com so it's really cheap.
It has needed pins Gnd, RxD and TxD
USB UART Converter
First open your fsg-3
There are 4 screw's on the bottom side
open the case
internal there are also 4 screws to lift the PCB+HDD
on this picture are 2
and on this picture are 2 screws
find the Con401
solder the cable on it
Pin 1 = GND
Pin 3 = RxD
Pin 6 = TxD
take a file and make a little hole at the place to put the cable through.
mark the Ground Cable, at the picture it is marked with pink colour
After that connect Gnd with Gnd
RxD with RxD and TxD with Txd
If u don't get the connections cross the RxD and TxD Cables.
open up a connection with HyperTerminal in windows or minicom
use Baudrate 115200 8N1 (8N1 == 8-bits per character, no parity, and 1 stop bit)
CTRL+C == ^C is the command to stop the RedBoot Bootload Script.
Airflow Mod for Sinking the Temperature
There is enough space to put air out from the fsg-3 fan.
But there are no holes to put fresh air into the fsg.
so i drilled 6 holes in the front