LightsOut Restore - RAID5 - Unable to see drives?

I am able to successfully boot my server into the LightsOut Restore environment. However, the LightsOut Restore environment does not detect the data partition of my hard drive. As a matter of fact, it only detects the Windows Recovery Environment partition and my USB stick that I have plugged in. As a result, I am unable to do any data backup/restore from the LightsOut Restore environment.

- Dell PE R330

- Windows Server 2012 R2

- Four physical hard drives, 2TB each

- RAID 5 hardware configuration, Dell PERC S130 controller

I have a feeling the problem has something to do with the server's RAID 5 structure, because LightsOut Restore works perfectly fine for devices with a single hard drive. I loaded the latest drivers of the RAID controller and disks into the environment, but still no change. So what am I missing? I have a feeling it is something very simple...