IBM Power Systems 9009-41A Manual page 111

Figure 96. Seating the NVMe. M.2 carrier card
15. Replace the RAID adapter, if present. Otherwise, continue with step "16" on page 101.
a) Route the front SAS cables into position while you lower the SAS RAID adapter into its slot. Push
the SAS RAID adapter down to seat the adapter. Push in and twist the screws (A) clockwise to
fully seat the adapter. See the following figure.
Removing and replacing the system backplane in the 9009-41A, 9009-42A, or 9223-42H 97