John Valentine 
i did that command before but not success
Username:admin
Password:
Enterasys A4
Command Line Interface
Enterasys Networks, Inc.
50 Minuteman Rd.
Andover, MA 01810-1008 U.S.A.
Phone: +1 978 684 1000
E-mail: support@enterasys.com
WWW: 
http://www.enterasys.com
(c) Copyright Enterasys Networks, Inc. 2011
Chassis Serial Number:      12240066905L
Chassis Firmware Revision:  03.03.01.0011
A4(su)->
A4(su)->
A4(su)->dir
Images:
==================================================================
Filename:      a-series_03.03.01.0011 (Active) (Boot)
Version:       03.03.01.0011
Size:          6064128 (bytes)
Date:          Thu Mar 31 06:26:44 2011
CheckSum:      818707264b41c7c00764fe4a70d7a467
Compatibility: A2H124-24, A2H123-24, A2H124-24P, A2H124-48, A2H124-48P
               A2H124-24FX, A2H254-16, A4H124-24TX, A4H124-24FX, A4H254-8F8T
               A4H124-24, A4H124-24P, A4H124-48, A4H124-48P
Files:                           Size
================================ ========
configs:
mysave.cfg                       2149
logs:
current.log                      5393
A4(su)->
A4(su)->copy images/a-series_03.03.01.0011 tftp://10.10.10.15/fw
Error: Couldn't open source file!
A4(su)->