DFI TPC121 Installation Guide - Manual (Page 17)

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3. The system board is equipped with a Mini PCIe slot.
The Mini PCIe slot supports half length Mini PCIe card.
Note the key on the slot. The key ensures the Mini
PCIe card can be plugged into the slot in only one
direction.
If you want to move the latch in order to use the desired
card, please follow below steps:
1. Remove the clips at each end of the latch once at a
time.
2. Press the clips to the center of the latch and pull it up.
3. Pull the clips up and remove the latch.
Removing the latch
Latch
Pull up
Press to
the center