What Is

BTHModem Sys: What is it and How to Fix Related BSoD Issues

Understanding BThModem Sys and Avoiding BSoD Problems


This Bthmodem.sys article is dedicated to unveiling this file because it is crucial to Windows 11 operating system. Because this file enables communication between your computer and other devices, it is essential to know how to use it carefully.

However, this system can sometimes cause crashes, resulting in the infamous Blue Screen of Death (BSOD) errors. In this article, we’ll discuss the file and how to identify common BSoD issues related to it. We will also look into how to fix them.

What is Bthmodem.sys?

In very simple and clear terms, the BThmodem.sys is the Microsoft Windows Bluetooth communications system driver file. It is an important system process Windows uses to ensure Bluetooth devices’ successful functioning.

The file is responsible for managing the synchronization between Bluetooth devices and Windows. It also helps in proper communication between the two. This file can offer the following benefits:

  • Reduced Latency: The Bthmodem.sys driver reduces the latency of Bluetooth data transfers, providing faster transfers.
  • Improved Power Efficiency: This driver helps improve Bluetooth connections’ power efficiency. This can lead to longer battery life.
  • Bluetooth Compatibility: This driver also ensures that Bluetooth devices will be compatible, regardless of manufacturer or model.
  • Fault Isolation: The driver helps keep Bluetooth devices isolated from each other. This can result in fewer interference issues.
  • Increased security: It can help to increase security. Bluetooth connections are encrypted and are generally more secure than traditional wired connections.
  • Centralized Configuration: This driver allows for the centralized configuration of all Bluetooth devices using a single interface. This makes it easier to make sure all devices are set up correctly.

What causes Bthmodem.sys BSOD errors?

There are several reasons why you may experience a BThmodem.sys error, and they include:

  • Unsigned Driver: If the version of the driver you have on your computer is a version that has not been signed correctly by Microsoft, it can cause a Bthmodem.sys BSOD error.
  • System Resources: If this driver has too many resources to operate, it can cause this BSOD error causing a system overload.
  • Corrupted File: Once the file is corrupt on your computer, it can cause this BSOD error.
  • Outdated Driver: When the driver on your computer is out-of-date, the system will not run correctly on the current version of Windows.
  • Hardware incompatibilities: Another cause of this error can be other corrupt or incompatible critical hardware components.
  • Overheating: Finally, these errors can also result from an overheating processor or other component.

How do I fix Bthmodem.sys BSOD errors?

1. Run Bluetooth troubleshooter

  1. Press the Window + I hotkeys to open the Settings menu.
  2. Then click System
    bthmodem sys
  3. Now you should select Troubleshoot.
    bthmodem sys
  4. Afterward, select Other troubleshooters.
    bthmodem sys
  5. Click Bluetooth, select Run, and follow the instructions.
    bthmodem sys

2. Scan for virus

  1. Press the Windows + S hotkeys simultaneously and enter the search word Windows Security. Then open the app.
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  2. After opening, click Virus & threat protection option.
  3. Then, use the Scan options to see all available scans.
  4. When the Windows Security page opens, choose the Full scan option and click Scan now to deep scan the computer for viruses or malware.
    d3dx9_27 dll

3. Update driver via settings

  1. Firstly, press the Windows + I keys together to open Settings or open by clicking the Windows icon on the Taskbar.
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  2. Then click the Windows Update option and the Check for updates button to find new updates.
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  3. Now click on Advanced Options. 
  4. Then click on the Optional updates section.
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  5. Finally, select the Driver Updates section and Download and Install all the available updates.
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  6. The driver will start to download. Allow the process to complete.
  7. Finally, restart your PC.

4. Perform a system restore

  1. Firstly, press the Windows +key combination to open the Run dialog on your PC and type rstrui. Press Enter after to open it.
  2. Click on Choose a different restore point when the System Restore wizard opens.
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  3. Then click on the Next button to continue. 
    msoadfsb.exe application error
  4. On the next window, choose your restore point and click Next
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  5. Allow the process to run and complete.
  6. Finally, click Finish when the restore is complete.

5. Uninstall and Reinstall Bluetooth driver

  1. Press the Windows and X keys simultaneously to open the Quick Link menu.
  2. Then, click on Device Manager or press the M key.
    bthmodem sys
  3. When Device Manager opens, find Bluetooth and expand it.
    bthmodem sys
  4. Then, right-click on the Bluetooth device and click Uninstall device on the option.
    bthmodem sys
  5. Finally, follow the on-screen instruction to complete the process.
  6. Restart the PC. When the PC is on and connected to the available network, it will automatically find the suitable Bluetooth driver for your Windows 11 OS and reinstall it.

6. Restore the driver’s default configuration

  1. Press the Windows + S keys together, enter cmd in the search field, and click Run as administrator.
    bthmodem sys
  2. If you receive a prompt from UAC, then click Yes to continue.
  3. On the Command Prompt, enter the following command and hit Enter:
    sc config BTHMODEM start= demand
    bthmodem sys
  4. Finally, restart your PC.

In conclusion, BThmodem.sys is a critical system driver responsible for managing Bluetooth connections for many devices. However, this driver can often lead to a dreaded Blue Screen of Death (BSoD) error, making it necessary to know how to troubleshoot and fix these issues.

When you understand the basics of the system and its function and how to diagnose, identify, and repair the problem, users should be able to eliminate any BSoD errors related to this system driver successfully.

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Richard Omachona
Richard is a techie in providing fixes and solutions for computer issues of various kinds. Among his contemporaries, he is a preferred choice. His experiences are vast in Windows operating systems, and several other skills in programming such as Python, Web Frontend designing implementing at industry standards, best practices in HTML, CSS and JavaScript. and basics in Web Backend. He also loves traveling, gaming and music.