How to Fix KB5034441 Fails to Install with Code 0x80070643?

Solution to Windows 10 KB5034441 Update installation failed (Error code 0x80070643)

On January 9, 2024, Microsoft released a KB5034441 security update for Windows 10 21H2 and 22H2, which fixes a security vulnerability in the Windows Recovery Environment (WinRE) that could allow attackers to bypass BitLocker encryption. However, many users have reported that they encountered an error code 0x80070643 when installing the KB5034441 update, causing the installation to fail. The full error message is as follows: "I encountered some issues during the update installation process, and we will try again later. This may help if you continue to see this issue and want to search the network or contact support for information: (0x80070643)"

Microsoft said that the reason why the installation of KB5034441 update failed is that the computer's recovery partition space is insufficient, which leads to the failure of WinRE update. The following two solutions are provided:

Method 1: Use the command prompt (for advanced users)

This method is quite complicated, and it is recommended that users who are not familiar with command line operations choose method 2.

Step 1: Enter "cmd" in the search box and right-click to select "Run as administrator".

Step 2: Run the command reagentc /info and press Enter to check the WinRE status. If WinRE is installed, the path to WinRE is displayed.

Step 3: If WinRE is enabled, run the command reagentc /disable and press Enter to disable it.

Step 4: Reduce the system partition and prepare disk space for the new recovery partition. Run the following commands in turn and press Enter after each command:

• diskpart
• list disk
• sel disk<os disk="" index=""></os> (Select the same disk index as WinRE)
• list part
• sel part<os partition index></os> (Select your operating system partition)
• shrink desired=250 minimum=250
• sel part<winre partition index></winre> (Select your WinRE partition)
• delete partition override

Step 5: Create a new recovery partition:

1. First check whether your disk is GPT or MBR format. Run list disk command to see if there is "*" in the "Gpt" column. If so, it is GPT; otherwise, it is MBR.

2. If your disk is GPT, run the following command:

• create partition primary id=de94bba4-06d1-4d40-a16a-bfd50179d6ac
• gpt attributes =0x8000000000000001

If your disk is MBR, run the command create partition primary id=27 .

3. Run the following commands in turn and press Enter after each command:

• format quick fs=ntfs label="Windows RE tools"
• list vol
• reagentc /enable
• reagentc /info

Step 6: Retry downloading and installing the KB5034441 update.

Method 2: Use MiniTool Partition Wizard (a more convenient method)

MiniTool Partition Wizard is a free partition management tool that provides easier steps to solve the problem of failed installation of KB5034441 update.

Step 1: Download and install the MiniTool Partition Wizard.

Step 2: Start the software and view disk and partition information.

Step 3: Find the recovery partition and select "Extended Partition" in the left panel.

Step 4: Drag the slider to resize and allocate at least 250MB of space from other partitions to the recovery partition.

Step 5: Click "Apply" to make the changes take effect.

Summarize

If you encounter KB5034441 installation failure and display error code 0x80070643 during the update process, please try the above method to solve this problem. Choose a method that suits your technical level.

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