Acer AR380 F1 - Manual (Page 75)

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2 Locate the DIMM slot on the mainboard.
3 Install the memory module.
a Align then insert the DIMM into the socket (1).
b Push the DIMM to the socket until the retaining clips snap inward (2).
Note: The DIMM slot is slotted to ensure proper installation. If you
insert a DIMM but it does not fit easily into the socket, you may
have inserted it incorrectly. Reverse the orientation of the DIMM
and insert it again.
4 Observe the post-installation instructions described on page 27.
5 Reconfigure the system memory. See “To reconfigure the system
memory” section on page 58 for more information.
Removing a memory module:
Important: Before removing any DIMM from the mainboard,
make sure to create a backup file of all important data.