The SSD is wrapped in ESD shielding that will need to be transferred to the replacement SSD. Alternatively, replacement shielding can be found here.

Use a pair of tweezers to slide the shielding off of the SSD.

If the shielding feels stuck, use a pair of tweezers to peel off and remove it instead. Take care to keep it in the best condition possible if you want to reuse it.

Only the SSD remains.

The Steam Deck uses a single-sided M.2 2230.

To recover, repair, or re-image your SSD, follow Valve's Steam Deck recovery instructions.

Note: The Steam Deck's buttons, thumbsticks, and touchpads may not register inputs at first after re-imaging the SSD. Use the touchscreen to follow initial SteamOS setup, allowing the device to download updates. Functionality should return once the Steam Deck restarts.