Stacking Dell PowerConnect Switches: 8132, 8132F, 8164, 8164F 
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The next step is to activate the image that contains the new firmware using the drop-down menus in 
the Next Active Image column.  In this example the backup image is selected for each unit.  
 
After selecting backup for each unit, click Apply. 
Go to the System > General > Reset page to reload the switch.