故障描述
H3C S1626 从V100R002升级到V100R004时，先使用WEB升级。提示无效文件名。后改Bootrom方式升级。提示如下错误：
Tftp error. Please try again!
BOOT MENU
1. Download application file to flash
2. Modify bootrom password
3. Restore default configurations of applicaiton
0. Reboot system
Enter your choice(0-3):1
Local IP Address <192.168.1.199>:192.168.1.11
Server IP Address <192.168.1.2>:
Netmask <255.255.255.0>:
File Name:S1626.bin
Are you sure to download file to flash? Yes or No(Y/N)y
Arp timeout!
Tftp error. Please try again!