"Tested with Arduino NG rev.c board."
If you did accidentally erased the FTDI's chip EEPROM. (I did while I was in search of interfacing the board with C#). I do hope this can put you out of misery :)
1) Download MProg (tool provided by FTDI which is able to program the FTDI from USB "on-site")
2) Connect your board
1) Open MProg
2) Click Tools > Read and Parse
3) Set the default settings according to the datasheet You'll see that you don't find all the settings in MProg.
4) Click the 'program' button (with the blue lightning symbol on it)
1) Open MProg
2) Click Tools > Read and Parse
3) Load the default settings file
"Attach:default_FT232RL_Arduino_NG_rev_c.zip"
4) Click the 'program' button (with the blue lightning symbol on it)
See the according thread.
Author: AndyD
version 1.0