Set your primary storage device (OS drive) to Option #1.
Flashing a BIOS on Chinese X99 motherboards carries risks. There are several hardware revisions of the MR9A Pro (some with different LAN chips or VRM layouts). Always verify that the BIOS file matches your specific PCB version (e.g., v1.0 vs v2.0) to avoid hardware conflicts. Final Thoughts
Key insights and common post-flashing or troubleshooting steps include:
Place Shell.efi on FAT32 USB → boot from it to run low-level commands ( mm to modify memory-mapped registers). machinist x99 mr9a pro bios
A common issue across many X99 platforms is erratic fan behavior or loud default fan curves.
Some revisions of the Machinist MR9A PRO ship with write protection enabled. Enter the BIOS, go to > PCH Configuration . Locate Bios Lock and set it to Disabled . Save changes and exit.
The MR9A Pro uses a UEFI (Unified Extensible Firmware Interface) designed to initialize hardware, manage boot sequences, and provide low-level system configuration. Set your primary storage device (OS drive) to Option #1
Community developers have created pre-modded BIOS files for the MR9A PRO that integrate the FFS driver required for the Turbo Unlock, alongside stable undervolting profiles (usually -50mV to -70mV to keep temperatures low).
Set your temperature curves or choose a profile (e.g., Quiet or Performance ) to reduce system noise. 4. The Holy Grail: Xeon Turbo Boost Unlock (Haswell-E V3)
In the boot tab, ensure UEFI boot is enabled for the M.2 NVMe drive. SATA Mode: Set to AHCI for optimal SSD performance. Always verify that the BIOS file matches your
Flashing a modified BIOS carries a risk of permanently bricking your motherboard. Ensure your PC is connected to an Uninterruptible Power Supply (UPS) during this process. Proceed at your own risk. Step-by-Step Flashing Guide via Windows (FPT Method) Step 1: Backup Your Stock BIOS
CSM Compatibility Support Module * Enter BIOS → Go to 'Advanced' tab → Select 'SATA Configuration'. * Change 'SATA Mode Selection' AliExpress
| Problem | Details | Workaround | |------|------|------| | | After CMOS reset or power loss, BIOS discards NVMe boot entry. | Reflash NVMe driver via UEFI shell or use Clover/OpenCore bootloader. | | Slow POST (30-60s) | Memory training every boot if Fast Boot disabled. | Enable Fast Boot + Memory Fast Boot (but may cause BSOD). | | Fan control resets | After sleep or reboot, custom fan curves reset to 100% PWM. | Use software like FanControl or SpeedFan in OS. | | SR-IOV/VT-d instability | Enabling IOMMU causes random PCIe device dropouts. | Keep VT-d disabled unless needed for VFIO passthrough. | | No CPU temperature on some sensors | BIOS shows 0°C or 127°C. | Ignore; use HWMonitor in OS. | | RAID not working | Despite Intel RST option, RAID volume fails on reboot. | Use software RAID (Windows Storage Spaces or mdadm). | | S3 sleep wake failure | System wakes to black screen or resets. | Use S4 (hibernate) or disable sleep entirely. |