3Com Switch 4210 Software Upgrading via TFTP

Download the update package (s3o03_01_12s56.exe) from 3Com website and unpack it.
Upload s4q04_08.btm, s4o03_01_12s56.app and s4p01_011.web to TFTP server.

Update a bootrom:

<switch>tftp 192.168.0.1 get s4q04_08.btm
<switch>boot bootrom s4q04_08.btm  
 This will update Bootrom on unit 1.  Continue? [Y/N] y
 Upgrading Bootrom, please wait...
 Upgrade Bootrom succeeded! 

Update a boot loader:

<switch>dir
<switch>delete /unreserved s4o03_01_05s56.app
<switch>tftp 192.168.0.1 get s4o03_01_12s56.app

<switch>boot boot-loader s4o03_01_12s56.app  
 The specified file will be booted next time on unit 1!

Update a web resource package:

<switch>delete /unreserved s4p01_04.web
<switch>tftp 192.168.0.1 get s4p01_011.web     
<switch>boot web-package s4p01_011.web main 

Verify a configuration:

<switch>dir
Directory of unit1>flash:/
   1 (*)   -rw-   3699245  Apr 07 2010 12:03:04   s4o03_01_12s56.app
   2 (*)   -rw-    598886  Apr 07 2010 12:12:17   s4p01_011.web
   3       -rw-      2136  Jan 01 2004 00:00:00   3comoscfg.def
   4 (*)   -rw-      4655  Apr 07 2010 11:18:41   3comoscfg.cfg
   5       -rw-    242416  Apr 07 2010 11:51:50   s4q04_08.btm
(*) -with main attribute   (b) -with backup attribute

<reboot>

<switch>display version
3Com Corporation
3Com Switch 4210 18-Port Software Version 3Com OS V3.01.12s56
Copyright (c) 2004-2009 3Com Corporation and its licensors, All rights reserved.
3Com Switch 4210 18-Port uptime is 0 week, 0 day, 0 hour, 1 minute

3Com Switch 4210 18-Port with 1 Processor 
64M     bytes SDRAM
8M      bytes Flash Memory
Config Register points to FLASH

Hardware Version is REV.D
Bootrom Version is 4.08
[Subslot 0] 16FE+2Combo SFP  Hardware Version is REV.D