If you are looking to change PCIe settings or overclock (which is not officially supported on B75), you may need to look for a custom BIOS mod.
If you want, I can:
This document covers the hardware architecture, BIOS capabilities, the Samsung "Fast Boot" architecture, common technical issues, and advanced recovery procedures. Samsung B75s1 Bios
Before you attempt any update, verify your existing BIOS version.
If you have experienced problems with your Samsung B75s1 board, have you tried looking for the official BIOS update on the Samsung support website as discussed in? Summary Table Description Key to Enter SATA Setting AHCI (Recommended) Best Utility Samsung SW Update If you are looking to change PCIe settings
Dual-channel DDR3 (Typically 1333/1600 MHz up to 16GB or 32GB depending on the specific OEM revision). Storage Interface: SATA 3.0 (6 Gbps) and SATA 2.0 (3 Gbps). Firmware Type: AMI UEFI BIOS customized by Samsung. How to Enter the Samsung B75s1 BIOS
This error happens when the BIOS cannot find a bootable operating system partition. If you have experienced problems with your Samsung
Identify your current BIOS version shown on the main BIOS screen. Method 1: Using the Samsung Update Utility (Recommended)
Samsung OEM motherboards found in pre-built desktop systems (like the Samsung Magic Station series) often require proprietary software.