Dell Alienware x16 R1 Service Manual page 13

Steps
1. Remove the two screws (M2.5x5) that secure the base cover to the palm-rest and keyboard assembly.
2. Loosen the four captive screws (M2.5x5) that secure the base cover to the palm-rest and keyboard assembly.
3. Using a plastic scribe, pry the base cover from the gap created after loosening the captive screws in the bottom left and continue
to work on the sides to open the base cover.
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