Lenovo ThinkPad Reserve Edition - Manual (Page 46)

To release the hooks, pull the cover toward you and upward, in the
direction shown by the arrow, while holding the sides of the computer as
shown in the drawing.
Tip: When pulling the cover toward you, hold the display side of the
cover in place so that it will not come off with the cover on the
underside.
4. Lift the cover.
Detaching and attaching the bottom side of the leather cover
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ThinkPad ® Reserve Edition Service and Troubleshooting Guide