1. Download the latest firmware from Dell's website
   1. Navigate to http://www.dell.com/support/ and enter in your service tag.  You should see downloads for this product, grab the latest firmware that is in a zipped folder.
2. Extract the .zip folder of the firmware
   
3. Console into the switch via SSH or direct console
4. Copy the current configuration to startup
   1. console#> copy running-config startup-config
      
5. Transfer the firmware to the switch
   1. TFTP Method
      1. console#> tftp://N3000_2000v6.1.2.4.stk backup
         
   2. USB Method (Directly attached to switch)
      1. console#> usb://N3000_2000v6.1.2.4.stk backup
         
         
6. Verify the backup version is the new build
   1. console#> show version
      
      
7. Activate the new firmware
   1. console#> boot system backup
      
      
8. Reboot the switch
   1. console#> reload
      
      
9. Verify the build is now up-to-date
   1. console#> show version
      
      
10. Update the boot code
    1. console#> update bootcode
       
       
11. Reboot the switch
    1. console#> reload
       
       

That should do it!