1-3To enter the BOOT menu, you should press within five seconds (full startup mode) or onesecond (fast startup mode) after the information “Press Ctrl-B to enter BOOT Menu...” displays.Otherwise, the system starts to extract the program; and if you want to enter the BOOT Menu at thistime, you will have to restart the switch.Enter the correct Boot ROM password (no password is set by default). The system enters the BOOTMenu:BOOT MENU1. Download application file to flash2. Select application file to boot3. Display all files in flash4. Delete file from flash5. Modify bootrom password6. Enter bootrom upgrade menu7. Skip current configuration file8. Set bootrom password recovery9. Set switch startup mode0. RebootEnter your choice(0-9):Loading by XModem through Console PortIntroduction to XModemXModem protocol is a file transfer protocol that is widely used due to its simplicity and high stability. TheXModem protocol transfers files through Console port. It supports two types of data packets (128 bytesand 1 KB), two check methods (checksum and CRC), and multiple attempts of error packetretransmission (generally the maximum number of retransmission attempts is ten).The XModem transmission procedure is completed by a receiving program and a sending program. Thereceiving program sends negotiation characters to negotiate a packet checking method. After thenegotiation, the sending program starts to transmit data packets. When receiving a complete packet,the receiving program checks the packet using the agreed method. If the check succeeds, the receivingprogram sends acknowledgement characters and the sending program proceeds to send anotherpacket. If the check fails, the receiving program sends negative acknowledgement characters and thesending program retransmits the packet.Loading Boot ROMFollow these steps to load the Boot ROM:Step 1: At the prompt "Enter your choice(0-9):" in the BOOT Menu, press <6> or , and thenpress to enter the Boot ROM update menu shown below:Bootrom update menu:1. Set TFTP protocol parameter
