Talk:FT2232 breakout board
From DP
Resetting the EEPROM
If you program the EEPROM incorrectly the device will not register for USB usage. In order to fix this I have been holding CS of the EEPROM to Ground, plugging in USB, then remove the hold on CS. Then resetting all the EEPROM to 0xff and restarting. - DanBUK.
