Loading By Xmodem Through Console Port - H3C S5600 SERIES Operation Manual

To enter the BOOT menu, you should press <Ctrl+B> within five seconds (full startup mode) or one
second (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 this
time, you will have to restart the switch.
Enter the correct Boot ROM password (no password is set by default). The system enters the BOOT
Menu:
BOOT
1. Download application file to flash
2. Select application file to boot
3. Display all files in flash
4. Delete file from flash
5. Modify bootrom password
6. Enter bootrom upgrade menu
7. Skip current configuration file
8. Set bootrom password recovery
9. Set switch startup mode
0. Reboot
Enter your choice(0-9):

Loading by XModem through Console Port

Introduction to XModem
XModem protocol is a file transfer protocol that is widely used due to its simplicity and high stability. The
XModem protocol transfers files through Console port. It supports two types of data packets (128 bytes
and 1 KB), two check methods (checksum and CRC), and multiple attempts of error packet
retransmission (generally the maximum number of retransmission attempts is ten).
The XModem transmission procedure is completed by a receiving program and a sending program. The
receiving program sends negotiation characters to negotiate a packet checking method. After the
negotiation, 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 receiving
program sends acknowledgement characters and the sending program proceeds to send another
packet. If the check fails, the receiving program sends negative acknowledgement characters and the
sending program retransmits the packet.
Loading Boot ROM
Follow these steps to load the Boot ROM:
Step 1: At the prompt "Enter your choice(0-9):" in the BOOT Menu, press <6> or <Ctrl+U>, and then
press <Enter> to enter the Boot ROM update menu shown below:
Bootrom update menu:
1. Set TFTP protocol parameter
MENU
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