Step 1: Connect physical network (LAN) or turn off "Advanced Stream Detect" option from Killer Control Center. (The purpose is for having network function to download new driver. This step can be bypass if download driver from another device)
Where is the Killer Control Center & Advanced Stream Detect?
1. Open the Killer Control Center from start menu
Image - find the Killer Control Center from start menu
2. Select " Settings" page and turn off "Advanced Stream Detect"
Image - Turn off Advanced Stream Detect
Step 2: Download and apply the latest Killer Wireless AC 1550 WiFi Driver and then reboot the system to take effect - the latest version is now available from Dell Drivers and Downloads.