Dell Latitude E5540 :: Unknown Device Driver

Jan 8, 2015

I have been running in to an issue lately with a Latitude E5540 laptop. 

The specs are:

Intel i5 cpu @ 1.9 ghz
4 gb RAM
x32 Windows 7

In my device manager it says that I have an unknown device and there is the warning symbol next to it. When I go to update the drivers it says that it can't find any drivers (I am connected to the Internet). I looked at the hardware ID and noticed that it was APCISMO8810, I then proceeded to research the driver, which I found was the ST Microelectronics Free Fall Sensor Driver. I also know what it's primary function is. 

The issue I keep running in to is that I have uninstalled the driver, and tried to re-install the driver from the Dell downloads. However halfway through the process the install wizard tells me that the most recently updated driver from dells site is older than the driver I currently have installed. (even though it says there is no driver installed)

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Also  under Chipset there is an Intel driver AMT SOL.   I installed that driver but the PCI Serial Port was still showing Unknown with the Yellow..In my case I had to then manually Update the driver as follows:

Open Device Manager > right click on PCI Serial Port and choose Update driver > choose Browse my computer and browse to the driver folder for the AMT SOL just created when you downloaded and installed the driver mentioned above.   Location for me is C:DellDriversR279202.

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