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The bottom of your Roomba can be easily removed by just removing the side brush, unscrewing four screws, and separating the plate from the device.
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Place your Roomba upside-down on a hard surface.
 
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While holding the side brush in place, use a Phillips #1 screwdriver to remove the 4.5mm screw from the center of the brush.
 
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Gently pull upwards on the brush to remove it.
 
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Rotate the Roomba upside-down so the bottom is facing towards you.
 
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Using a Phillips #2 screwdriver, remove the captive screws that hold the bottom plate in place.
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.