Avast Error Code 0x8009000bu

Avast Boot Scan Error Code 0x8009000bu

The error occurs on the system when an authentication problem arises on the Avast program. Consider the below solutions to fix the error 0x00900bu.

Password not syncing:

  • If the Avast Antivirus and the Avast Password do not sync, the error 0x8009000bu occurs. Use the following steps to synchronize them.
  • Open the Avast program on the computer, and click Privacy on the left navigation panel.
  • Choose the Passwords icon on the right-side panel.
  • In the Passwords panel, click the Settings menu at the top right of the window.
  • Below Settings, click the Sync & backup menu on the left side panel and then click on the Turn On button from the right side.
  • If you are not signed in to your Avast account, then log in using the necessary credentials.
  • After that, check if the device is syncing under My synced device.
  • Verify whether the Avast error on the system is fixed.

Access denied:

  • When the Google account, which you use to log in to the Avast program on the device, does not allow the applications, then the error message appears.
  • On your web browser, sign in to the Google account.
  • Select the My Account menu on the Sign-in & Security panel, click on the Connected apps & sites option. 
  • Next, navigate to the Allow less secure apps menu and turn on the feature by clicking the toggle button.

Issues with the Avast program:

  • Sometimes, the Avast software itself faces functional problems; in such cases, use the Avast repair feature to resolve the problem.
  • After launching the Avast application on the computer, go to the top of the window and select Menu.
  • Choose the Settings menu on the right-side panel.
  • Next, click the General icon on the left navigation panel and then select Troubleshooting. 
  • Following it, click the Repair App button; after that, enter the password to begin the troubleshooting.
Avast Boot Scan Error Code 0x8009000bu