最基本的物质需求得到满足之后，唯一能够不断增加个人幸福感的事情就是帮助他人

一、已有条件
SSG 520:
boot loader版本：SaipanLoader Version 1.0.2
新下载bootloader版本：1.0.7，Loadssg500v107.d
PC机：安装 Cisco TFTP Server，将Loadssg500v107.d 放置到该目录下。PC机ip地址是 192.168.170.210

二、步骤
1、将PC机串口连接SSG 520 Console口，将PC机网口连接SSG 520 ethernet0/0，PC机ip地址为192.168.170.210。启动TFTP Server。

2、开启终端工具（如windows hyperterminal），启动SSG 5。终端工具中显示

ScreenOS Saipanloader V1.0.2
Built Jan 19 2006/17:57:03
watchdog_probe, 1046 bus/dev/fn = 0/248 ich = 2640
boot_drive = 80
start1 = 0768, start2 = 3840

Hit 'X' and 'A' to upgrade bootloader此时Boot Loader版本为1.0.2，Hit 'X' and 'A',

3、
Loader File Name:Loadssg500v107.d
Self IP Address :192.168.170.91(设备bootloader ip地址)
TFTP IP Address :192.168.170.210

Saipan motherboard proto 3 or later detected
Probing...[Ethernet0/0 and Ethernet0/1]

Initiating hardware and waiting for link up ...
self_ip = 192.168.170.91, tftp_server_ip = 192.168.170.210
ip = 192.168.170.91 mask = 255.0.0.0 gw = 0.0.0.0 svr = 192.168.170.210
network_ready = 1
Loadssg500v107.d
buf_read = 22775, fp->maxposition = 121079
offset = 0, maxposition = 121079
121079 bytes downloaded from tftp server
old img size = 120104, new img size = 121032, load = 121079, sig = 47

Ignore image authentication!
mounting FAT12 partition
file /boot2 size was 120151, new size is 121079
f_start = 122 f_end = 181
getting sector information
boot1 size = 512
boot2 size = 512

boot2               .               .               .               .
.               . undetermined RESET

设备重启

4、终端中显示
ScreenOS Saipanloader V1.0.7
Built Mar 19 2009/15:54:12
Built Mar 19 2009/15:54:12
可以看到，boot loader已升级成功。

标签： Boot Loader Upgrade, Juniper SSG 520