BIOS and OS Installation for Dell Precision 7920 Rack

I recently acquired a Dell Precision 7920 Rack, in my attempt to set it up I have encountered some challenges:
1. After upgrading BIOS to version 2.22.2 and iDRAC 9 Firmware Version 7.00.00.174, on boot up it's appearing as a PowerEdge R740.
What could be causing this problem?

2. When I ignore the above challenge and proceed to try install an OS, the HDDs do not display and I get the error, "we could'nt find any drives. To get a storage driver, click Load Driver". I have tried loading Intel Rapid Storage Technology Drivers but none of them are compatible.

Kindly assist on how to resolve the above challenges?