The XPS 15 L521X is a network device manufactured by Dell. Issues like weak Wi-Fi signal, slow DNS lookup, duplicate IP addresses, slow network and excessive CPU usage can be solved by updating this driver. This version of "DW1901_Atheros_W74_A01_X04_Setup-GKYK9_ZPE.exe" is rated (5 out of 5 stars) based on 31 downloads and 9 reviews. Compatibility for this driver update includes PCs running Windows operating systems such as Windows 7. The total disk space used for this update is 187.5 MB.
XPS 15 L521X
Atheros Bluetooth Bus
Atheros Valkyrie BootROM
Bluetooth A2DP Sink
Bluetooth A2DP Source
Bluetooth AV Remote Control Target
Bluetooth AVRCP Device
Bluetooth Advanced Remote Control Service
Windows 7 (64 bit)
A01.00 (10-Dec-2013)
Bluetooth Driver File
Sharmila (DG Staff Member) on 11-Aug-2017
BTHENUM\{00001106-0000-1000-8000-00805F9B34FB}
BTHENUM\{00001109-0000-1000-8000-00805F9B34FB}
BTHENUM\{0000110A-0000-1000-8000-00805F9B34FB}
BTHENUM\{0000110B-0000-1000-8000-00805F9B34FB}
BTHENUM\{0000110C-0000-1000-8000-00805F9B34FB}
BTHENUM\{0000110D-0000-1000-8000-00805F9B34FB}
BTHENUM\{0000110E-0000-1000-8000-00805F9B34FB}
BTHENUM\{00001111-0000-1000-8000-00805F9B34FB}
BTHENUM\{00001117-0000-1000-8000-00805F9B34FB}
BTHENUM\{00001118-0000-1000-8000-00805F9B34FB}
BTHENUM\{0000111E-0000-1000-8000-00805F9B34FB}
BTHENUM\{0000111F-0000-1000-8000-00805F9B34FB}
To get the XPS 15 L521X driver, click the green download button above. After you complete your download, move on to Step 2.
If the driver listed is not the right version or operating system, search our driver archive for the correct version. Enter Dell XPS 15 L521X into the search box above and then submit. In the results, choose the best match for your PC and operating system.
Tech Tip: If you are having trouble deciding which is the right driver, try the Dell Driver Update Utility. It is a software utility which automatically finds and downloads the right driver.
To find the newest driver, you may need to visit the Dell website. Most major device manufacturers update their drivers regularly.
After downloading your new driver, installation is the next step. On Windows, utilize the built-in Device Manager utility to manage this process. This tool provides a comprehensive view of all system-recognized devices and their associated drivers. To complete the installation, a system restart is typically required for the driver update to take effect.
Tech Tip: Driver downloads and updates come in a variety of file formats with different file extensions. For example, you may have downloaded an EXE, INF, ZIP, or SYS file. Each file type has a slighty different installation procedure to follow.
For more help, visit our Driver Support Page for step-by-step videos on how to install drivers for every file type.
The following files are found inside the driver download file.
| Name | Size | Date |
|---|---|---|
| 0x0401.ini | 19.0 KB | 21 May 2009 |
| 0x0402.ini | 23.5 KB | 22 Apr 2009 |
| 0x0404.ini | 10.3 KB | 22 May 2009 |
| 0x0405.ini | 22.2 KB | 21 May 2009 |
| 0x0406.ini | 22.8 KB | 21 May 2009 |
| 0x0407.ini | 24.7 KB | 21 May 2009 |
| 0x0408.ini | 26.1 KB | 19 Mar 2009 |
| 0x0409.ini | 21.5 KB | 22 May 2009 |
| 0x040a.ini | 24.0 KB | 21 May 2009 |
| 0x040b.ini | 21.6 KB | 19 Mar 2009 |
| 0x040c.ini | 25.0 KB | 21 May 2009 |
| 0x040d.ini | 18.1 KB | 17 Mar 2009 |
| 0x040e.ini | 22.3 KB | 19 Mar 2009 |
| 0x0410.ini | 23.8 KB | 21 May 2009 |
| 0x0411.ini | 14.4 KB | 9 Jun 2009 |
| 0x0412.ini | 13.5 KB | 17 Mar 2009 |
| 0x0413.ini | 23.8 KB | 21 May 2009 |
| 0x0414.ini | 22.8 KB | 21 May 2009 |
| 0x0415.ini | 23.1 KB | 21 May 2009 |
| 0x0416.ini | 23.0 KB | 21 May 2009 |
| 0x0418.ini | 23.5 KB | 21 May 2009 |
| 0x0419.ini | 22.3 KB | 21 May 2009 |
| 0x041a.ini | 22.4 KB | 21 May 2009 |
| 0x041b.ini | 22.4 KB | 21 May 2009 |
| 0x041d.ini | 22.2 KB | 21 May 2009 |
| 0x041e.ini | 21.6 KB | 19 Mar 2009 |
| 0x041f.ini | 22.0 KB | 21 May 2009 |
| 0x0424.ini | 22.7 KB | 21 May 2009 |
| 0x0804.ini | 10.3 KB | 22 May 2009 |
| 0x0816.ini | 23.6 KB | 21 May 2009 |
| 0x0c04.ini | 10.3 KB | 21 Jun 2012 |
| 0x0c1a.ini | 22.7 KB | 19 Mar 2009 |
| Config.ini | 112 bytes | 27 Dec 2012 |
| ISSetup.dll | 580.7 KB | 4 Jan 2013 |
| Setup_MUP.exe | 197.2 KB | 27 Dec 2012 |
| Version.txt | 694 bytes | 6 Feb 2013 |
| data1.cab | 138.3 MB | 4 Jan 2013 |
| data2.cab | 38.5 MB | 4 Jan 2013 |
| default.ath | 155 bytes | 7 Jan 2013 |
| drivers/production/Windows7-x64/Bluetooth-Driver/BthAthFax.inf | 13.8 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/Bthci.dll | 21.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/DIFxAPI.dll | 525.8 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/WdfCoInstaller01009.dll | 1.7 MB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/athdfu.cat | 7.6 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/athdfu.inf | 1.9 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/athdfu.sys | 52.4 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/atheros_bth.cat | 7.9 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/atheros_bth.inf | 5.1 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/athrextx.cat | 46.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/athrx.sys | 2.2 MB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_a2dp.cat | 8.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_a2dp.inf | 7.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_a2dp.sys | 341.1 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_avdt.sys | 111.2 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_bus.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_bus.inf | 2.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_bus.sys | 30.8 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_flt.cat | 19.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_flt.inf | 13.8 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_flt.sys | 36.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_hcrp.cat | 8.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_hcrp.inf | 2.8 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_hcrp.sys | 168.1 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_hid.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_hid.inf | 2.3 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_hid.sys | 358.3 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_lwflt.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_lwflt.inf | 2.4 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_lwflt.sys | 68.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_rcp.cat | 7.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_rcp.inf | 2.3 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_rcp.sys | 281.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_sco.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_vdp.cat | 8.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_vdp.inf | 3.3 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btath_vdp.sys | 422.1 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btatherosInstall.exe | 69.2 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btfaxmdm.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/btfilter.sys | 551.6 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/bthathfax.sys | 75.9 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/leath_hid.cat | 7.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/leath_hid.inf | 3.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/leath_hid.sys | 36.6 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/Bluetooth-Driver/netathrx.inf | 320.4 KB | 27 Dec 2012 |
| drivers/production/Windows7-x64/WLAN-Driver/athrextx.cat | 8.8 KB | 4 Jan 2013 |
| drivers/production/Windows7-x64/WLAN-Driver/athrx.sys | 3.8 MB | 21 Dec 2012 |
| drivers/production/Windows7-x64/WLAN-Driver/netathrx.inf | 24.4 KB | 4 Jan 2013 |
| drivers/production/Windows7-x86/Bluetooth-Driver/BthAthFax.inf | 13.8 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/Bthci.dll | 21.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/DIFxAPI.dll | 319.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/WdfCoInstaller01009.dll | 1.5 MB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/athdfu.cat | 7.6 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/athdfu.inf | 1.9 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/athdfu.sys | 44.2 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/atheros_bth.cat | 7.9 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/atheros_bth.inf | 5.1 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/athr.sys | 1.7 MB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/athrext.cat | 46.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_a2dp.cat | 8.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_a2dp.inf | 7.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_a2dp.sys | 299.6 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_avdt.sys | 98.4 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_bus.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_bus.inf | 2.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_bus.sys | 25.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_flt.cat | 19.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_flt.inf | 13.8 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_flt.sys | 36.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_hcrp.cat | 8.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_hcrp.inf | 2.8 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_hcrp.sys | 148.1 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_hid.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_hid.inf | 2.3 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_hid.sys | 316.2 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_lwflt.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_lwflt.inf | 2.4 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_lwflt.sys | 60.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_rcp.cat | 7.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_rcp.inf | 2.2 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_rcp.sys | 264.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_sco.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_vdp.cat | 8.0 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_vdp.inf | 3.3 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btath_vdp.sys | 412.9 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btatherosInstall.exe | 67.2 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btfaxmdm.cat | 7.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/btfilter.sys | 470.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/bthathfax.sys | 59.5 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/leath_hid.cat | 7.7 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/leath_hid.inf | 2.9 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/leath_hid.sys | 32.4 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/Bluetooth-Driver/netathr.inf | 318.9 KB | 27 Dec 2012 |
| drivers/production/Windows7-x86/WLAN-Driver/athr.sys | 3.1 MB | 21 Dec 2012 |
| drivers/production/Windows7-x86/WLAN-Driver/athrext.cat | 8.8 KB | 4 Jan 2013 |
| drivers/production/Windows7-x86/WLAN-Driver/netathr.inf | 24.3 KB | 4 Jan 2013 |
| layout.bin | 1.0 KB | 4 Jan 2013 |
| mup.xml | 6.3 KB | 27 Dec 2012 |
| setup.exe | 806.5 KB | 4 Jan 2013 |
| setup.ini | 1.5 KB | 4 Jan 2013 |
| setupconfig.ini | 1.6 KB | 9 Jan 2012 |