Acrosser AR-R5700 - Manual (Page 10)

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2. Remove the dummy bracket (default for AR-R5700) out from the PCI-E
slot via unlock the screws on the front-side of chassis, as shown in Fig-08.
Fig-08. Unlock the screws for PCI-E (Modules) card
3. Tighten the PCI-E cards (modules) via locking the screw-nuts as shown in
Fig-09
Fig-09 Lock PCI card
Screw driver on lock
Unscrew
Unscrew
Take out
PCI-E slot
PCI-E slot