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How to Fix Asus P9X79 LE Error in Device Manager. This fix gets rid of multiple “System Base Device” bangs in device manager. The BIOS update must be applied FIRST or you will not get this board to post.

Components used in this example

Asus P9X79-LE with Intel Ivy Bridge i7-4820K processor. This fix will NOT work out of the box unless the motherboard has a BIOS version 4407 or higher. We are using v4407 in this example along with a follow up patch kit required to clean up device manager afterward. However there may be newer BIOS versions available, get the latest version when you download the BIOS file.

​The Problem

An indication that you need a BIOS update is the CPU led stays solid RED and you get no POST using the the Asus P9X79-LE with an Intel Ivy Bridge CPU. Note that this same problem can happen with other Asus X79 motherboards (P9X79, P9X79 Deluxe, X79 Deluxe, P9X79 WS or P9X79 Pro)and the procedure is pretty much the same it just uses a different BIOS file.

Asus claims that the X79 Deluxe (not P9X79 Deluxe) motherboard is Ivy Bride-E (4900 series) ready however, we found the same problem every now and then. As mentioned above, the fix process is the same except the BIOS file.

​Before you begin

This BIOS update uses the USB Flashback update method described in the Asus manual and detailed below. You will need an empty USB pen drive formatted FAT 32.

PART 1- Update the BIOS

  • Determine what BIOS version you currently have. The BIOS version is printed right on the motherboard. Look for the last 4 digits on white stick below BIOS label on board.​

Download the BIOS Update

  • Download 4407 or newer bios file directly from Asus website (no other). Type in the model # of the motherboard and search.
  • Under the BIOS section download the BIOS file called It containing a file called P9X79-LE-ASUS-4407.CAP. This is the bios file you need to copy to a USB drive. Note older bios versions require a converter to take it to a CAP but 4407 is already a CAP format. That installer if needed will pop up automatically.

Rename the File

  • !!! Rename the BIOS update file from P9X79-LE-ASUS-4407.CAP – to – “P9X79LE.CAP”. This is very Important or BIOS will not work at all.
  • If you have an X79-Deluxe motherboard, make sure you put the hypen in when searching for it on the Asus site. For the Asus X79-Deluxe (not P9X79 Deluxe) the BIOS file is named Rename that file to X79DLX.CAP and continue.
  • With CAP bios file on clean FAT 32 formatted USB drive, insert in the special BIOS update USB port. It is marked differently than all other USB ports because it has a white border around the port.

BIOS Flashback Button

  • With power only connected and minimal memory, press and hold BIOS flashback button which is right on the motherboard (LE etc) or on the back of board (Deluxe is on the back) depending on model. It should start flashing after 3-4 seconds then let go.
  • If it stays STEADY something is not right. STOP. Start over or try a different USB drive or confirm that you have renamed the BIOS file exactly as described above. If you do not this is what happens.
  • If you have a USB drive that has a light you will see it flickering. This is indicates that the BIOS is being applied. DO NOT DISTURB. Takes a few minutes.

When it is Done

  • When done all lights will stop. Time to boot it up and verify your BIOS version. You can do that in BIOS or Accessories/System Information in Windows ​
  • This will get you into Windows now check device manager, you will notice that you have 30 plus bangs in there called Base System Device and maybe others. Proceed to next step to take care of that.

PART 2 – Apply All 3 Fixes

NOTE this fix must be applied AFTER the BIOS update above. NOTE the links here are for the P9X79 LE motherboard ONLY. If you have a different board search for yoru model on the Asus website and follow the same procedure.

1.) Intel(r) Chipset Device Software (INF) from the Intel website. File name is (infinst_autol.exe) different than #3.

The above file is an executable but you can also download the zip file, unzip it and point to the folder location when updating the driver via device manager (“Browse my computer
for driver software”).

2.) Intel(R) Management Engine Interface (V9.0.0.1287 or newer) for Windows Vista/7/8 32bit & 64bit.(WHQL) Download from the Asus Website under Driver updates for the P9X79 LE.

3.) Intel Chipset Software Installation (INF) (V9.3.2.1014 or newer for Win 7/Vista 32/64bit . This INF is just a backup in case step #1 does not do the trick. Check Device manager to see if it is clean after step #2 is complete you may not need this one. If you launch it , it will tell you that you have a newer version installed in step #1. If so skip this step.

​Apply the fixes in this order. It should eliminate the bangs you have in device manager after the BIOS update in PART #1.

Check your Device Manager to make sure it is clean. On our Deluxe model update we found bangs on USB 3.0 in DVM and we had to manually download the USB 3.0 drivers from the Asus site (or just run the motherboard CD) but after that it was perfect.

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