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M2_1~4: M.2 Slots (Key M)
Installing M.2 module into M2_1 slot
1.  Press and hold the end button of Screwless M.2 Shield Frozr heatsink.
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M2_1
M2_2
M2_4
M2_3
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Important
If your M.2 SSD equips its own heatsink, please remove the M.2 plates or rubber cubes 
in the M.2 slots before installing M.2 SSD. Do not re-install the heatsinks supplied 
with your motherboard.
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 ∙ https://youtu.be/J88vcXeLido