b) To lock the divider in its slot, lift up on the retaining latch at the back edge of the divider (C) as
shown in the following figure.
Figure 110. Locking the retaining latch on the PCIe divider
Removing and replacing the system backplane in the 5105-22E, 9008-22L, 9009-22A, 9009-22G, 9223-22H,
or 9223-22S 109