Blandster,   The CS24-NV7 was a non branded system based on the C1100 cloud. I believe the issue you're having is the latest supported OS for those systems was Server 2008 R2. Now in regards to the BIOS update, it is discussed on the POST found here.   Let me know if this helps.  
Hi,  For some reason I cannot get this server to boot from a memory stick. I want to put Windows Server 2019 on this server on one of the drives but unfortunately it wont take it. It keeps flashing a hash with a black background. No matter what USB port or drive I put in it doesn't take it. Can anyone help?!?!    Also is there a BIOS update for this?    Thank You Jordan
Dell PowerEdge CS24-NV7 Issues