upgrade & replacement
2. Put the CPU cover on and secure 3 screws (M2*4L(K)) to fix it.
Install battery module.
Put the battery module into its compartment.

WLAN Module R eplacement

WLAN This slot usually has Wireless LAN module when leaving the factory, this slot is
for optional system upgrade.

Replacing WLAN module

Remove battery module
2. Turn the notebook over. Unlock and hold the latch, and remove the battery .
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