MSI 7D40-005R Manuel D'utilisation page 29

M2_1~2: M.2 Slots (Key M)
⚠
Important
Intel® RST only supports PCIe M.2 SSD with UEFI ROM.
Installing M.2 module into M2_1 slot
1. Loosen the screws of M.2 Shield Frozr heatsink.
2. Lift up the M.2 Shield Frozr heatsink and remove it.
3. Secure the supplied M.2 standoff.
M2_1
2 2
3 3
27
1 1
1 1
M2_2