Windows update (KB5034441) Error (0x80070643)

That's all users here can suggest. Microsoft published a possible fix to increase the size of the recovery partition.

KB5028997: Instructions to manually resize your partition to install the WinRE update - Microsoft Support

IF YOU FOLLOW THIS LINK, THIS FIXES THE ISSUE!

An issue with Update (KB5034441)

Microsoft needs to fix the update and re-release it so that thew update can decrease C: Drive by 250MB, delete the Recovery partition and re-create the Recovery partition with a larger size to allow the update to be successsful.

I resized my partition and it didn't work. It's good that it worked for you.

I could not complete a delete and re-create of this partition as it is part of my boot drive and the command "delete partition override" is not allowed, will not work. So to do this would require a boot off the System Drive to a CD or USB. I will try that perhaps. Would like to see Microsoft fix this as I have three computers that have the same problem. I could try a ESD reformat to see if this might work. If the Recovery Partition just is recreated to the same size, the same problem will be there. I will get a Boot Disk and try to get around the MS issue with changing the Win Boot Drive.

That's not encouraging to hear! How much disk did you allocate? I over-allocated due to the disk already having a lot of unallocated space, i.e. I didn't need to shrink anything, just remove the previous recovery partition, thankfully the last partition, and then create fresh but larger.

I am casting my memory back some weeks now, but I seem to recall there was a 250Mb recovery partition with next to no usage. The advice is to resize by 250Mb, but from memory, given all the unallocated space, I created a new partition of 1Gb and it all worked. And it also used something absurd like 50Mb after the update was done.

I could check on the other machine on what space finally was used ... certainly AFTER the update the used recovery partition space was considerably less that the ORIGINAL partition size

It worked. Follow the original guide. OS does not mean recovery. Directions not clear. You shrink from the PRIMARY drive. I did 1000 instead of 250. Then proceed as normal. It just requires a bit of reading. I REPEAT, YOU DO NOT RESIZE YOUR RECOVERY. YOU TAKE THAT FROM YOUR PRIMARY.

Once you do that, THEN you select your recovery drive and continue to follow instructions. Once done, and I mean at the end of everything(if you didn't end up there you did it wrong or didn't read) then proceed here.

https://support.microsoft.com/en-us/topic/kb5034957-updating-the-winre-partition-on-deployed-devices-to-address-security-vulnerabilities-in-cve-2024-20666-0190331b-1ca3-42d8-8a55-7fc406910c10
Go to powershell, run as admin and run the entire script for your set up starting from LITERALLY, Param (

Let it run all the way till it stops and requires a DL. Get the latest here for your rig.

https://www.catalog.update.microsoft.com/Search.aspx?q=Safe%20OS
I used the top for mine.

Copy the file link, as in the entire line, mine was like

Downloads\windows10.0-kb5034232-x64_ff4651e9e031bad04f7fa645dc3dee1fe1435f38.cab

Put that into the powershell. Then it should complete on its own. Restart PC. Proceed to install update.

You're welcome.