Introduction
Make sure to remove the battery first to avoid any incidents.
Tools
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            "Unlock" your battery by moving the switch as shown so that an unlocked lock on a red background is shown. 
 
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            Next move the other switch, while the unlocked symbol is still showing. The battery should pop up, and no longer be flush with the bottom of the laptop. 
 
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            Unscrew both of the screws that are holding the back panel in place with the Philips #00 head. 
 
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            Once both screws have been removed use a plastic opening tool to lift the panel up. Starting with the indented notch , and moving left and right from there. 
 
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            After the panel has been loosened by the plastic opening tool, take your finger, place it in the gap, and remove the panel from the laptop. 
 
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To reassemble your device, follow these instructions in reverse order.
One comment
which bus-ram acer 5253 can use? i know it use bus 1066 but i don't know with bus 1666 how is machine active?