Acer Altos R520 M2 Series User Manual page 86

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To remove a memory module:
Important: Before removing any DIMM from the mainboard,
make sure to create a backup file of all important data.
1 Perform the pre-installation instructions described on page 36.
2 Remove the air duct to access the DIMM slots. Perform the
instructions described in "To remove the air duct" section on page
41.
3 Remove the memory module.
(1) Press the holding clips on both sides of the DIMM slot outward
to release the DIMM.
(2) Gently pull the DIMM upward to remove it from the DIMM
slot.
4 If you intend to install a new DIMM, refer to previous section for
related procedure, otherwise reinstall the air duct, then observe
the post-installation instructions described on page 36.
3 System upgrade