[Article] Windows Update error 0x80070643 in Windows 10 when Updating KB5034441

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You might observe error 0x80070643 when you check for update in Windows 10. If you click on Windows update history, then you might see update failure for KB5034441. If that is the case, then it is a known issue and Microsoft is working on fixing the issue. You may check Windows Update and if other updates has been installed successfully, you may ignore this message. However, if you observe different error message or same error message for a different update. Please feel free to search for solution in this forum or ask question. There is a workaround on resolving this problem by resize your partition. However, due to technical difficulty and potential risk of incorrect partitioning, I advise not to change partition and wait for official fix from Microsoft. However, in case you want to change partition, make sure take a complete backup of your data and have Windows 10 installation media ready so in case of failure, you may quickly perform the recovery and have a look at KB5028997: Instructions to manually resize your partition to install the WinRE update - Microsoft Support.

You may have a look at KB5034441: Windows Recovery Environment update for Windows 10, version 21H2 and 22H2: January 9, 2024 - Microsoft Support.

Microsoft Released a PowerShell script to resize the WinRE, you may have a look at Add an update to Windows RE | Microsoft Learn.