FM2A85X Extreme4 no drivers to windows 10

The "inbox driver" means the drivers that are included with Windows 10. So in a sense the drivers are "in the box", or part of Windows 10 itself. Not the greatest term but one that has been used for years to describe the drivers that are included in Windows.

In your case, we must consider the chipset that your board is based upon, which is the AMD A85X FCH.

We must also know that drivers for a board's chipset and its functions are provided by the manufacture of the chipset. That is AMD of course. ASRock and all other mother board manufactures do not create the drivers for the various chips used in a mother board. Those drivers and associated software are all provided by the chip's manufacture.

The A85X chipset was discontinued by AMD, and we don't see any new boards from ASRock using this chip. AMD apparently has not continued to provide driver support for this chipset. Which is why ASRock support can only suggest using the Windows 10 "inbox drivers".

If you have installed Win 10 on your board, then hopefully the inbox drivers are enough to allow the A85X chipset to function normally. You could try to find drivers for the A85X for Windows 10 from AMD, but when I looked at other mother board manufactures download pages for their A85X boards, there were no Windows 10 drivers for this chipset.