How to Fix 0x80070643 Error on Windows 10

The 0x80070643 error results from an issue with the KB5034232 update on Windows 10. In this post, we will look into why you have come across it and how you can fix it.

How to Fix 0x80070643 Error on Windows 10

The KB5034232 update is the Safe OS Dynamic Update to Windows Recovery Environment (WinRE), released to resolve CVE-2024-20666, a security vulnerability that reportedly bypassed BitLocker encryption.

Before you apply this update, it is important to know that it requires 250 MB in free space in the recovery partition of your PC; otherwise, it will result in an incomplete installation, and you will get “security update failed; there were some problems installing updates” as an error.

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Below, we'll address issues regarding the error code 0x80070643 on Windows 10 by explaining how you can fix it.

How to Fix 0x80070643 Error on Windows 10

0x80070643 Error

To fix 0x80070643 on Windows 10, you need to resize your system partition manually. This can be done by running simple commands as an administrator using the command prompt.

First, you must open Windows Search, search for “Command Prompt”, and click on “Run as administrator”.

Next, you will run these commands (the texts in bold) one by one:

  1. reagentc /info (This will confirm the “Windows RE location” path. The number after “harddisk” and “partition” is the index and partition of WinRE).
  2. reagentc /disable (This will disable WinRE)
  3. diskpart
  4. list disk
  5. sel disk<OS disk index>
  6. list part
  7. sel part<OS partition index>
  8. shrink desired=250 minimum=250
  9. sel part <WinRE partition index>
  10. delete partition override
  11. list disk (To check partition style—(*) on GPT means GPT, (*) on MBR means MBR)
  12. For GPT: create partition primary id=de94bba4-06d1-4d40-a16a-bfd50179d6ac, gpt attributes=0x8000000000000001
  13. For MBR: create partition primary id=27
  14. format quick fs=ntfs label=” Windows RE tools” (To format the partition)
  15. list vol (To confirm that the Windows Recovery partition is successfully created)
  16. exit
  17. reagentc /enable (To re-enable WinRE)
  18. reagentc /info (To confirm WinRE location)
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After running the commands (in bold) above, you should try and install the KB5034441 update again.

Please ensure that after running the command in the first step, a Windows RE location similar to this will open: \?\GLOBALROOT\device\harddisk1\partition4\Recovery\WindowsRE. Note that harddisk1 is the index of WinRE while partition4 and the recovery index of the partition of WinRE.

You must replace <OS disk index> with the number after “harddisk” in the first step above (for example, sel disk 1).

Afterwards, replace <OS partition index> with the number after “partition” and “primary” type in the fourth step (for example, sel part 3).

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Finally, replace <WinRE partition index> with the number after the “partition” and “recovery” type in step 1 (e.g. sel part 4).