Realtek Semiconductor Corp. Bluetooth Driver Update (1.9.1040.4027) Driver 1.9.1040.4027
by Realtek
What you are downloading
This file comes straight from Microsoft's own download server - the same one Windows Update uses. We do not host it, repack it or change it in any way - the download button takes you to the manufacturer's server, not to a file of ours.
- Package
- 61e9cf36-1551-4895-903f-eb6818687d75_62ddba147ce19db50f71c44829056170b845e433.cab, 336 KB
- Published by
- Realtek Semiconductor Corp.
- Digitally signed
- Windows checks this signature before installing
- Inside
- 5 files - the driver itself, its setup instructions and a digital signature file
Show the full listHide the list
- PidVid_List.dat1 KB
- RtkBtfilter.sys815 KB
- Rtkfilter.inf3 KB
- rtkfilter.cat12 KB
- rtl8761b_mp_chip_bt40_fw_asic_rom_patch_new.dat42 KB
Nothing happens on its own: you download the file and decide yourself whether to install it.
- Manufacturer
- Realtek
- Driver version
1.9.1040.4027- Release date
- May 12, 2026
- Supported Windows
- Windows 8.1, Windows 8
- Architecture
- 32-bit (x86)
- File size
- 336 KB
- File name
61e9cf36-1551-4895-903f-eb6818687d75_62ddba147ce19db50f71c44829056170b845e433.cab- Digital signature
- Signed - catalog
RtkFilter.cat - INF version
05/12/2026,1.9.1040.4027- INF provider
- Realtek Semiconductor Corp.
- Device class
- Bluetooth
- Source
- Microsoft Update Catalog
- Last verified
- September 9, 2026
- SHA-256
60c42e947fd51bfb8b1b697badd167e3a90ea46cf8df2a6ec2642ffb7ea37057
Supported hardware IDs (2)
Compare with your device: Device Manager → right-click the device → Properties → Details → Hardware Ids. If one of the values above matches, this driver supports your hardware.
How to install
Before you start: create a restore point (Start → type "Create a restore point" → Create). It takes a minute and lets you undo everything if the new driver turns out worse than the old one. This driver is made for Windows 8.1, Windows 8 (32-bit) - if your Windows is different, look for another version further down the page.
This driver comes as a .cab file. Double-clicking it will not install anything - Windows only shows you what is inside. Install it through Device Manager instead:
- Right-click the downloaded file → Extract All → choose a folder you will not lose (the Desktop is fine) → Extract.
- Hold the Windows key and press X, then open Device Manager.
- Find the device that is not working - it usually has a yellow triangle, or sits under "Other devices" with a name like "Network controller".
- Right-click it → Update driver→ "Browse my computer for drivers".
- Click Browse, choose the folder you extracted into, tick Include subfolders, then Next.
- Windows finds the driver in that folder and installs it. Restart the computer afterwards.
If Windows answers "The best drivers for your device are already installed" - that does not mean your driver is fine, only that Windows prefers its own version. In the same window choose "Let me pick from a list of available drivers" → "Have Disk" → Browse → point to the file ending in .inf inside the extracted folder → OK.
Check it worked: open Device Manager again. The device should no longer show a warning icon, and its driver version should match the one on this page.
How to roll back
If the device stops working after the update: Device Manager → right-click the device → Properties → Driver tab → Roll Back Driver. If that button is greyed out, use the restore point you made before installing (Start → "Recovery" → Open System Restore).