You should not have any trouble jumping from that version to the current 3.3.5.5.  If you are not familiar with the command line on the switch you can download the firmware from a location on your management workstation thru http. You would start by downloading the 3.3.5.5 from support.dell.com. Save that to a folder.  Then from the WebGUI of the switch you can go to System/File Management/File Download you would choose HTTP for the transfer mode then browse to the location of the firmware on you desktop.  Below is a screen shot of the File download page.  [IMAGE]
I am wanting to update the firmware on my Powerconnect 6224 switch from Version 3.3.1.10 to Version 3.3.5.5.  Is there any issue with this jump or will it not matter?  I also would like some words of wisdom as how to make this upgrade as painless as possible.  Sincerely, Ken
Updating Firmware on Powerconnect 6224 Switch