Introduction
Tools
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            Flip the device on its head. 
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            Using the Phillips #2 screwdriver, unscrew the four 12 mm screws found at each corner of the bottom panel. 
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            Lift the panel off or flip the device over and let the panel drop out. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
At least on my unit, those screws weren't Phillips, but Torx Tamperproof T20! Shame on you, De'Longhi!
netrolller3d -
I also had the Tamperproof Torx on mine - I used a Dremel tool with a small round metal bit and just carefully plunged down on the little nub in the center that makes it tamperproof. Only need to grind it down a millimeter or so, as there isn't much torque on these screws and the torx bit needs just a little depth to grab on it good enough. If you have the tools handy it saves having to buy the tamperproof bits online.
Alef Alpha -