Your system variant does not have the Dell Wireless 380 card and hence it fails to install. Install. BIOS A21: [URL] See notes regarding updating the BIOS [URL]  The Free Fall Sensor: [URL] Intel Chipset Device Software: [URL] Intel Management Engine Interface Driver: [URL] O2 Micro Card Reader: [URL] Intel Identity Protection Utility: [URL] Intel N-6250 Wireless: [URL] Intel N-6250 Bluetooth: [URL]  Touchpad: [URL] Audio Inbuilt Intel Ethernet Driver: [URL] Intel Video: [URL] NVidia Video: [URL] Intel Device Manager Diagnostics Utility: [URL] Control Point System Manager Application: [URL] Let me know if any errors remain in the device manager. 
When I try to install dell WLAN and Bluetooth driver, it appear " activate bluetooth using wireless switch". My laptop"Dell Latitude e6420 run ms windows 8.1". Please help me !
How to activate Bluetooth using wireless switch on dell latitude e6420 (early 
2011)