Dell XPS 15 9550 - No Wifi After Clean Reinstall Windows 10 Pro

You're missing (probably among others) the chipset drivers, which you can get and install from here:

https://www.dell.com/support/home/en-us/product-support/product/xps-15-9550-laptop/drivers

Then install the wireless driver.

Hi.  Can you tell me specifically which drivers is that?   So first type in my service tag into dell site.  Then it shows the drivers that are available.  Do I click on network and download those?  Or do I download the ones already shown on the page?

You say install the wireless driver but which one or ones is that on the page?

After I type in my dell service tag on dell site... this is what shows as the drivers for MY PC.  Some show popular and some show popular and urgent. 

I had downloaded the Dell Wireless 1820A/1830 Wifi driver and Dell Wireless 1820A Bluetooth Driver on my windows desktop.  Then transferred the files to a usb flash drive... but got message 

Are you sure you want to copy this file without its properties?  The file ........ has properties that can't be copied to the new location.  I clicked yes.  Then I connected this usb to my dell xps laptop and I believe I installed both drivers.  But there is no wifi nor the dell wireless driver isn't even shown when i search for it on start menu.

Realtek High Definition Audio Driver        POPULAR    Audio

Realtek Memory Card Reader Driver      POPULAR    Chipset

Intel Thunderbolt Firmware Update         POPULAR    Chipset

Intel Dynamic Platform and Thermal Framework Driver           POPULAR    Chipset

Intel Rapid Storage Technology Driver and Manage Console   POPULAR  Serial ATA

Dell Help and Support Application                                             POPULAR   Application

Intel HID Event Filter Driver                   Chipset

Intel HID Event Filter Driver                    System Utilities

Dell Foundation Services  Application     Application

Dell Wireless 1820A/1830 Wi-fi Driver     Network

Dell Wireless 1820A Bluetooth Driver     Network

Intel HD/Iris/Iris Pro Graphics Driver       Video

Dell Wireless 1830 Wifi Driver                           Modem/Communications

Dell Update/Alienware Update Application       Application

Dell Wireless 1830 Bluetooth Application         Modem/Communications               

Realtek USB GBE Ethernet Controller Driver   Docks/Stands

Intel 100 Series Chipset Driver                         Chipset

Realtek USB Audio Legacy Driver                     Docks/Stands

Intel Serial IO Driver                                          Chipset

STMicroelectronics Free Fall Data Protection Driver      Chipset

STMicroelectronics Motion Sensor Driver                       System Utilities

ASMedia USB extensible Host Controller Driver               Docks/Stands

Intel Chipset Device Software                                           Chipset

Realtek USB Audio Driver                                                 Docks/Stands

Dell/Alienware Digital Delivery Application                         Application

Dell SupportAssist OS Recovery Plugin for Dell Update    Application

Dell Customer Connect                                                      Application

Intel Thunderbolt Controller Driver                        POPULAR URGENT    Chipset 

NVIDIA GeForce/Quadro Series Graphics Driver  POPULAR URGENT    Video

Intel Management Engine Components Installer    POPULAR URGENT   Chipset

Dell XPS 15 9550 System BIOS                               POPULAR URGENT  BIOS

Please view the information in link below, hopefully it will be a help to you

How to Install Dell Drivers in the Correct Order | Dell US

Also, you could consider using Support Assist application to install latest Dell drivers / firmware and applications for the computer. Just click on link below and download / install the application onto the computer. 

SupportAssist for home PCs | Dell US

After installing Support Assist application, type Support Assist onto the search box, you should be able to see the application now.

@quickguide01  I will try to help you once here. The Network Controller that you see in Device Manager is your WiFi card without any drivers loaded. View its properties, go to Details, and change the dropdown selection to “Hardware Ids”. You will see PCI Ven and Dev codes on a line there. Each will be four characters. If you Google those, you should be able to find out the WiFi card vendor and model and therefore the correct driver to install. If you can’t figure that out, post the VEN and DEV codes here.

Once you get WiFi working, you can download and install Dell Update to get most or all remaining drivers.

I was able to get the wifi working by downloading those two network drivers.  Then opening and extracting the files.  I then clicked on check for windows updates and then it updated.  So now I have internet.  I then went to dell driver site and downloaded all the drivers that were labeled as urgent except the BIOS.  That is recommended right? 

The laptop appears to work but

But when I go to other devices, it shows these devices with yellow exclamation points.  These need to be fixed right?

BCM2045A0
PCI Data Acquisition and Signal Processing Controller
PCI Data Acquisition and Signal Processing Controller
PCI Memory Controler
SM Bus Controller
Unknown Device
Unknown Device
Unknown Device
Unknown Device
Unknown Device
Unknown Device
Unknown Device

Previously before I got the wifi working and installed windows updates and those required drivers... it showed these had exclamation marks

3D Video Controller
bcm2045a0
Network Controller
pci data acquisition and signal processing controller
pci data acquisition and signal processing controller
pci device
pci memory controller
sm bus controller
unknown device
unknown device
unknown device

@quickguide01  Download and install Dell Update, which will handle the necessary BIOS, firmware, and driver installations/updates. Get the Windows Universal Application version: https://www.dell.com/support/kbdoc/en-us/000187189/dell-update-alienware-update

How did you get back the wifi? I am also facing the same problem.

Hi bro i am also facing same problem could you tell me which drivers you used solve this problem please 

Well you can try the following fix:

1. Press Windows + X and click on 'Device Manager'.
2. Now, right click on network adapter and choose 'Uninstall'.
3. Click on 'Delete the driver software for this device'.
4. Reboot the system and Windows will automatically reinstall the drivers.

Also tried changing the wifi adaptor to intel 9260 didnt work

I uninstalled and rebooted as mentioned but windows didnt reinstall the drivers and i dont see wifi anywhere