How To Update Firmware Dell 2848

Using TFTP and the CLI to download software and boot code
1. Connect to the serial port (default setting 9600 baud, 8 data bits, no start bits, 1 stop bits) and enter the CLI mode. The following prompt is displayed:
console>
2. Ensure that an IP address is assigned to at least one port on the switch. Use the following commands to assign an IP address to vlan 1 (this example uses IP address 10.10.10.101).
console> enable
console# config
console# interface vlan 1
console(config-if)# ip address 10.10.10.101 /24
console(config-if)# exit
config(config)# exit
config#
3. Enter console#copy tftp://{tftp address}/{file name} image to copy the software to the switch. The software is copied but does not become active until the file is selected as the active image file and the switch is reset. The following is an example of the information that is displayed:
console# copy tftp://10.10.10.10/powerconnect_28xx-10045.ros image
24-Jul-2013 12:05:12 %COPY-I-FILECPY: Files Copy - source URL tftp://10.10.10.10/powerconnect_28xx-10045.ros destination URL flash://image
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 24-Jul-2013 12:06:04 %COPY-N-TRAP: The copy operation was completed successfully!
Copy: 3447887 bytes copied in 00:00:52 [hh:mm:ss]
NOTE: A TFTP server must be on the network and the switch software must be accessible by the TFTP server before attempting to download the switch software by TFTP.
4. Enter console#copy tftp://{tftp address}/{file name} boot to copy the boot software to the switch. The boot software is copied but does not become active until the switch is reset. The following is an example of the information that is displayed:
console# copy tftp://10.10.10.10/powerconnect_28xx_boot-10013.rfb boot
24-Jul-2013 01:06:07 %COPY-I-FILECPY: Files Copy - source URL tftp://10.10.10.10/powerconnect_28xx_boot-10013.rfb destination URL flash://BOOT
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!24-Jul-2013 01:06:23 %COPY-N-TRAP: The copy operation was completed successfully
!
Copy: 524304 bytes copied in 00:00:16 [hh:mm:ss]
console#
5. Type reload. The following message is displayed:
console# reload
This command will reset the whole system and disconnect your current session. Do you want to continue (y/n)[n]?
6. Type Y. The switch reboots.

http://www.dell.com/support/home/sg/en/sgbsd1/product-support/product/powerconnect-2824/drivers