[Offer] Asus ROG Maximus IX Apex BIOS Mods (with ReBar Support)


List of updated modules:
ME Firmware Ver: 11.8.50.3399 → 11.7.0.1261 (Downgraded for Coffee Lake with Intel PTT Support)
Disk Controller:

  • EFI Intel RST RAID Driver - 15.5.0.2875 → 15.9.3.3408
  • OROM Intel RST for SATA - 15.5.0.2875 → 15.9.3.3408

Video OnBoard:

  • EFI GOP Driver SKL-KBL - 9.0.1051 → 9.0.1113
  • RAW GOP VBT SKYLAKE - 207 → 228
  • OROM VBIOS SKL-KBL - 1046 → 1062

Network:

  • EFI Intel Gigabit Driver - 0.0.13 → 0.1.02
  • OROM Intel Boot Agent CL - 0.1.10 → 0.1.16

Microcodes:

  • Stock updated to the latest (506E3 - v. F2, 906E9 - v.FA)
  • Coffee Lake mCodes (906EA - v.FA | 906EB - v. F6 | 906EC - v.F8 | 906ED - v.F104) (Latest as per 12 December 2025)

Inserted Modules:

  • ReBarDxe v0.3
  • NvStrapsRebar v0.4-rc1

** CoffeeLake is possible using this bios, if you’re able to downgrade the ME Firmware to 11.7.0.xxxx (The bios attached below has been rebuilt using FIT, with ME 11.7.0.1261 Enabled, but im unable to downgrade since i have ME FW 11.8, might post an update if i succeed).

** Somehow in my usage, for the Intel PTT to work with this bios, i need to fully UEFI mode the bios before enabling PTT, so disable Launch CSM, install Secure Boot keys, save and exit then reboot to bios, and then i can enable PTT with PTP Aware, or else it would hang. This might wont happen to others.


How To Enable Resizable Bar

  • Normal Resizable Bar: Use ReBarSate from here, And Run as Admin.
  • Nvidia Turing (GTX 1600/RTX 2000): Use this, And Run as Admin.

You need to enable Above 4G Decoding for Resizable Bar and Disable CSM/Legacy (boot to UEFI only). To enable it, go to bios → Boot → Above 4G Decoding and enable it.


Download: M9A_Complete.rar (6.9 MB) (Flash using Bios Flashback)