2。用超級終端和控制線連到交換機，超級終端的設置是： 9600 baud rate No parity 8 data bits 1 stop bit No flow control
3。按住交換機前面板的“mode”按鈕，插上電源線，當端口1上面的燈不亮后，放松“mode”按鈕；
4。這時超級終端上應該顯示： The system has been interrupted PRior to initializing the Flash file system. The following commands will initialize the flash file system, and finish loading the Operating system software:
flash_init load_helper boot
5。輸入flash_init
6。輸入load_helper
7. 輸入dir flash: 這時顯示： Directory of flash: 2 -rwx 843947 Mar 01 1993 00:02:18 C2900XL-h-mz-112.8-SA 4 drwx 3776 Mar 01 1993 01:23:24 Html 66 -rwx 130 Jan 01 1970 00:01:19 env_vars 68 -rwx 1296 Mar 01 1993 06:55:51 config.text 1728000 bytes total (456704 bytes free)
8。輸入rename flash:config.text flash:config.old
9.輸入boot，重新啟動系統
10。系統啟動完后顯示：Continue with the configuration dialog? [yes/no] : 輸入N
