First, Enter the bootrom menu: 1. connect the device through the Console port. 2. Reboot the device. During the device boot process, the following device boot information appears in the window of Hyper Terminal. 3. Press Ctrl+B to enter Main Menu... 3. Press Ctrl+B within 3 seconds after the message appears. 4. enter the boot main menu password to enter the boot main menu, for V800R011C10 and its previous versions, the default value of the password is WWW@HUAWEI