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How to Fix the ERROR_INVALID_SIGNAL_NUMBER 209 (0xD1)
Ensure all the device drivers are up to date
5 min. read
Published onNovember 6, 2024
published onNovember 6, 2024
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Fix all BSoD events and keep computer safe and clean:
Fortect will find the cause of BSoD and fix it. Here is how to do it with 3 easy steps:
The ERROR_INVALID_SIGNAL_NUMBER 209 (0xD1) with the error message, The signal being posted is not correct appears when a signal is incorrectly handled or there is an issue with the driver or hardware communication.
To fix it, you must look for signs of hardware failure and ensure your Windows is updated to the latest version. Unplug external devices like USB peripherals, hard drives, and printers, and restart your computer.
How can I fix the ERROR_INVALID_SIGNAL_NUMBER 209 (0xD1)?
1. Update the device drivers
Windows will try to find the latest version of the driver; however, if it fails, you can head to themanufacturer’s websiteto download it. Alternatively, you can download & install areliable driver updatertoolto get the driver.
2. Run the CHKDSK scan
3. Run the SFC & DISM scans
4. Disable Driver Signature enforcement
Once done, Windows will boot normally, but the system will not allow the installation of unsigned drivers. You can now install unsigned drivers if required. Remember that this method is temporary, and the change will only last for the current session.
5. Restart your computer in a clean boot environment
Now you can identify if a third-party background program or service is causing the issue and fix the ERROR_INVALID_SIGNAL_NUMBER issue.
6. Rollback the recent device driver
7. Restore your device to the previous version
Windows will now restart, and try to restore your computer settings to the selected version. IfSystem Restore is not working on your computer, it could be corrupted system files or antivirus blocking the system restore; read this guide to learn more.
In conclusion, to fix the ERROR_INVALID_SIGNAL_NUMBER, you need to update the device driver, rollback the recent driver update, restore the PC to the previous version, restart your PC in clean boot, run CHKDSK, SFC, and DISM scans.
If you have any questions or suggestions about this BSoD error, feel free to mention them in the comments section below.
More about the topics:BSoD error codes,BSoD errors,Windows 11
Srishti Sisodia
Windows Software Expert
Srishti Sisodia is an electronics engineer and writer with a passion for technology. She has extensive experience exploring the latest technological advancements and sharing her insights through informative blogs.
Her diverse interests bring a unique perspective to her work, and she approaches everything with commitment, enthusiasm, and a willingness to learn. That’s why she’s part of Windows Report’s Reviewers team, always willing to share the real-life experience with any software or hardware product. She’s also specialized in Azure, cloud computing, and AI.
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Srishti Sisodia
Windows Software Expert
She is an electronics engineer and writer with a passion for technology. Srishti is specialized in Azure, cloud computing, and AI.
