Unknown device "PCI Serial Port" after Windows 10 upgrade 2740P

[dintym]

Device manager now showing Unknown device "PCI Serial Port" after Windows 10 upgrade, this is my last hurdle.

Location:  PCI bus 0, device 22, function 3. 

Events Information: Device PCI\VEN_8086&DEV_3B67&SUBSYS_7007103C&REV_06\3&b1bfb68&0&B3 requires further installation.

Thanks for any help!

dintym

[Huffer]

Its Intel AMT. See this old post for a driver suggestion from @Paul_Tikkanen 

https://h30434.www3.hp.com/t5/Desktop-Operating-Systems-and-Recovery/PCI-Serial-Port-Driver/td-p/593...

[Paul_Tikkanen · Accepted solution]

Hi, @dintym 

The driver I posted for the 8000 Elite CMT will not work for your notebook.

It is for an older chipset and does not have driver support for the hardware ID you posted.

You have to use the driver that I zipped up and attached below, which I pulled out of the W7 Intel Management Engine driver file from your notebook's support page.

You can't just run the file on the support page because it will try to install an older version of the Intel Management Engine Interface, and that will mess things up for you.

You will have to manually install the driver as follows...

Download and unzip the file I attached to its folder.   Do not do anything with the files in the folder.

Go to the device manager and click on the PCI Serial Port needing the driver.

Click on the driver tab.  Click on Update driver.

Select the Browse my computer for driver software option, and browse to the driver folder you unzipped.

Make sure the Include subfolders box is checked, and the driver will install.

Then restart the PC.