How to Fix Windows 10 Update Failed “Your device is missing important security and quality fixes”?

Problem

Windows 10 unable to perform Windows Update with error “Your device is missing important security and quality fixes.”, after clicking on “Check for updates” button still showing “You’re not up to date” message with same error message.

Additionally, Windows 10 System Tray show Windows Update error icon with red exclamation mark as below.

Solution 1: Enable Windows Update Advanced Option

1. Open Start > Settings > Update & Security.
2. Click Advanced options link.
3. Make sure Give me updates for other Microsoft products when I update Windows is checked.

Solution 2: Make sure Country or region setting is correct

1. Open Start > Time & language > Region & language.
2. Under Country or region, select the country you want to use from the drop-down menu.
3. Restart Windows.

Solution 3: Install Missing Windows 10 Update released September, 2018

1. Visit Microsoft Update Catalog website to download stand-alone package for below update:
   KB4457128: September 11, 2018—KB4457128 (OS Build 17134.285)
   KB4456655: Servicing stack update for Windows 10, version 1803: September 11, 2018
   KB4457146: Security update for Adobe Flash Player: September 11, 2018
   KB4100347: Intel microcode updates
2. Install downloaded stand-alone package.
3. Restart Windows.

Solution 4: Reset Windows Update History and Files

1. Open cmd.exe with Run as administrator option
2. Type the following command:

   net stop bits
   net stop wuauserv
   net stop appidsvc
   net stop cryptsvc

3. Open Windows Explorer and navigate to C:\Windows\SoftwareDistribution folder, right-click and choose Rename option. Change its name to SoftwareDistribution.old and apply the changes.
4. Open cmd.exe with Run as administrator option
5. Type the following command:

   net start bits
   net start wuauserv
   net start appidsvc
   net start cryptsvc

Solution 5: Update BIOS

1. Perform BIOS and Chipset update. Refer to this article for [How to Access BIOS or Boot Menu using Windows 10 Recovery Advanced Startup]
2. Restart and try to perform Windows Update again.