Step 2. (Optional) If you are replacing the system I/O board, do the following:1. Install the firmware and RoT security module removed from the old system I/O board onto thenew system I/O board. See “Install the firmware and RoT security module” on page 251.2. Install the MicroSD card.Figure 232. Installing the MicroSD carda. Place the card onto the socket with the contacts of the MicroSD card facingdownwards.b. Close the socket hinge.c. Slide the socket lid to LOCK direction.Step 3. Depending on your need, do one of the following:• If you are going to replace the system I/O board and reuse the processor board, install a newsystem I/O board onto the processor board.• If you are going to replace the processor board and reuse the system I/O board, install theexisting system I/O board onto a new processor board.260 ThinkSystem SR665 V3 User Guide