Error Invalid Flag Number 186 (0xBA): How to Fix it

Error_Invalid_Flag_Number usually comes with the following code 186 (0xBA) and The flag passed is not correct message.

This is a developer error, but sometimes regular users can encounter it when updating Windows, and if this happens, this guide will show you a couple of solutions that you can use.

How can I fix Error_Invalid_Flag_Number?

1. Reset Windows Update Components

1. Press the Windows key + S and type cmd. Choose Run as administrator.
   
2. Next, run the following commands:
   net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Ren C:\Windows\System32\catroot2 Catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
3. Check if the issue is gone.

To make this process faster, you can always use the Windows Update Components reset script.

2. Perform an in-place upgrade

1. Visit the Windows 11 download page.
2. Select the edition you want to download.
   
3. Next, choose the language.
4. Lastly, click on 64-bit Download.
   
5. Once the ISO file is downloaded, double-click it to mount it.
6. Select the setup.exe file.
   
7. Follow the instructions on the screen.
8. Be sure to select the Keep personal files and apps option to preserve all your files.
   
9. Follow the instructions on the screen to complete the process.

3. Other tips to try

1. If you’re upgrading Windows remove third-party antivirus software and disconnect all peripherals.
2. If a specific application is giving you this error, try reinstalling it.
3. Adjust the flags. For this, it might be necessary to contact the application developer.

The Error_Invalid_Flag_Number is an obscure error, but if you ever encounter it, try our solutions. If you have found a different solution that worked for you, don’t hesitate to share it with us in the comments section.

Before you leave, don’t miss our guides on ERROR_INVALID_SEGMENT_NUMBER and ERROR_INVALID_EVENT_COUNT for more information.

Our latest guide covers Error_No_Signal_Sent, so don’t miss it for more useful tips.