Step 5: Install the Heatsink, Mount the SSD, and Plug the Battery Back In

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Closeup of a person repairing a Steam Deck console
Slide your new SSD (with any heat sink attached, as shown) into the slot.
Closeup of a person repairing a Steam Deck console
Screw it down.
Closeup of a person repairing a Steam Deck console
Gently push the battery back into place.