PowerConnect 5324 IP Management Issue

Hi,

We have a pair of PowerConnect 5324's in production which seem to have lost IP management access, ie not pingable and we are unable to manage via ssh/telnet, http/https,  or snmp. Layer-2 switching is fine however.

The two switches used to be remotely manageable fine then suddenly it stopped working. The two switches have dedicated management ports (g24)with an IP on the vlan (250)assigned to that management port

I have read that there some bugs on earlier releases of the firmware due to a memory leak issue with snmp(http://en.community.dell.com/support-forums/network-switches/f/866/p/19333140/19699749.aspx#19699749), we have remote console access to the switches, we rebooted the switches recently which I was hoping would temporarily fix the problem so that we could remote upload the new firmware from a tftp server however the problem after the reboot still persisted. We have a copy of firmware version 2.0.1.4, which other methods/options are available to us in order to upload the latest firmware?

# sh system
System Description:                       Neyland 24T
System Up Time (days,hour:min:sec):       09,14:47:32
System Contact:                           support@xxxxx.com
System Name:                              xxxxxxxxxxx
System Location:
System MAC Address:                       00:19:b9:95:13:ab
System Object ID:                         1.3.6.1.4.1.674.10895.3004
Type:                                     PowerConnect 5324

Main Power Supply Status:                 OK
Fan 1 Status:                             OK
Fan 2 Status:                             OK

# sh ver
SW version    2.0.0.39 ( date  25-Oct-2006 time  19:40:34 )
Boot version    1.0.2.02 ( date  23-Jul-2006 time  16:45:47 )
HW version    00.00.02

Config Snippet;

interface ethernet g24
description to_xxx-x-x-01-m-01:e12
exit
interface range ethernet g(3-4,16,21-24)
speed 100
exit
bridge aging-time 10
interface ethernet g12
switchport mode trunk
exit
vlan database
vlan 100-101,200,250-251
exit
interface range ethernet g(1-11,13-14,17-20)
switchport access vlan 100
exit
interface ethernet g12
switchport trunk allowed vlan add 100
exit
interface range ethernet g(15-16)
switchport access vlan 101
exit
interface range ethernet g(21-23)
switchport access vlan 200
exit
interface ethernet g12
switchport trunk allowed vlan add 200
exit
interface ethernet g24
switchport access vlan 250
exit
interface range ethernet g(1-21,24)
no negotiation
exit
interface vlan 250
ip address x.x.x.x 255.255.255.192
exit
arp timeout 3600
ip default-gateway x.x.x.x
hostname xxxxxx
logging x.x.x.x
logging buffered size 400
aaa authentication login LOCAL local
line telnet
login authentication LOCAL
exit
line ssh
login authentication LOCAL
exit
line console
login authentication LOCAL
exit
enable password level xxxxxxxxxxxxx
username xxxxxxxxxxxxx
username xxxxxxxxxxxxxxx
ip ssh server
snmp-server contact support@xxxxxx.com
snmp-server community xxxxxx ro view Default
no ip http server
sntp server x.x.x.x
no ip domain-lookup


Thanks.