Lenovo ThinkPad R14 User Manual page 50

6. Remove the screw 1 . Carefully remove the M.2 solid-state drive assembly out of the slot 2 .
7. Take the M.2 solid-state drive out of the bracket.
8. Put the new M.2 solid-state drive into the bracket.
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E14/R14/E15/S3 Gen 2 User Guide