MSI MICRO ATX BX11 Manual page 21

Procedure for detaching the Retention Cap:
Notch
Hole
Retention Cap
(Top View)
To remove the Retention Cap, you need a Screw Driver (0.3 cm) tip.
- Insert the screw driver into the retention cap notch hole.
- Push the retention cap plastic lock inward.
- Pull the retention cap upward.
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