Windows 11 Update 23H2 Error 0x800705b9

caitlou · Oct 28, 2025

Hello! I have a HP envy laptop that randomly stopped working and was requiring the bitlocker code to try and do anything, which I had, but ended up in a constant cycle of trying to do anything with my laptop, it failing, and sending me back to reenter the code. I couldn't wipe and reset the laptop without it failing either. I have taken it to a repair shop, where they manage to wipe and reinstall windows onto it. I have been advised to ensure windows is completely up to date before doing anything else on it now, however whenever I try to download and install the 23H2 KB5067112 update, it fails with error 0x800705b9. I have tried windows update trouble shooting and other things but this doesn't change the install error! any help on how to fix this will be greatly appreciated as the laptop is only 14 months old and I or anyone I've spoke to have no idea why this is happening, thank you!

antspants · Oct 28, 2025

Welcome to the forum

A repair install is a shortcut to fixing this issue (most of the time)

You could try it.
If your PC is Windows 11compatible, use Option One
If the PC is not compatible with Windows 11, use Option Two and create the install media with Rufus.

Repair Install Windows 11 with an In-place Upgrade

This tutorial will show you how to do a repair install of Windows 11 by performing an in-place upgrade without losing anything. If you need to repair or create a new recovery partition or having problems with the Windows 11 operating system on your PC, and the usual solutions will not fix it...

www.elevenforum.com

For Option Two, download the ISO using Media Creation Tool and tell it to create the ISO as apposed to creating the USB media.
Then use Rufus to create the install media and use option two the the in-place upgrade tutorial

Option One below to download with MCT:

Download Official Windows 11 ISO file from Microsoft

This tutorial will show you how to download an official Windows Server or Windows 11 64-bit or ARM64 ISO file from Microsoft. Microsoft provides ISO files for Windows Server and Windows 11 to download. You can use these ISO files to clean install or in-place upgrade Windows 11. The Flight Hub...

www.elevenforum.com

Then:
Download Rufus

Create the install media:

Use option two in the in-place upgrade. Or simply open the install.exe as administrator on the Rufus USB via File Explorer. Remember to Keep everything when asked.

Repair Install Windows 11 with an In-place Upgrade

This tutorial will show you how to do a repair install of Windows 11 by performing an in-place upgrade without losing anything. If you need to repair or create a new recovery partition or having problems with the Windows 11 operating system on your PC, and the usual solutions will not fix it...

www.elevenforum.com

caitlou · Oct 28, 2025

antspants said:
I actually don’t know why that is, maybe I could trouble @Brink and ask? I think someone else reported this earlier this year but I can’t find it in a search.

Yes seen lots of posts on various websites about it, but everything suggested to fix it hasn't worked for me unfortunately

antspants · Oct 28, 2025

To bypass this, you could use option two with an install media via Media Creation Tool (Let it create the USB)
Run install.exe as admin from the USB in File Explorer
Just make sure you keep everything when running the install

Or have you already tried this?

antspants · Oct 28, 2025

Or you could just mount the downloaded ISO and do it that way (install.exe)

caitlou · Oct 28, 2025

antspants said:
To bypass this, you could use option two with an install media via Media Creation Tool (Let it create the USB)
Run install.exe as admin from the USB in File Explorer
Just make sure you keep everything when running the install

Or have you already tried this?

I have not tried this as I currently don't have access to a usb or dvd etc (which I believe I'd need, but correct me if I'm wrong as I am now pretty clueless to what I am doing)

antspants · Oct 28, 2025

caitlou said:
I have not tried this as I currently don't have access to a usb or dvd etc (which I believe I'd need, but correct me if I'm wrong as I am now pretty clueless to what I am doing)

All good.

Download the ISO using Media Creation Tool (Option One)
When Media Creation Tool asks if you want to create a usb or just get the ISO: Choose ISO
When it is finished downloading, right click on the ISO and select “Mount” at the top of the context menu
- Or just follow Option Two in the In-Place tutorial
Go to the mounted ISO in File Explorer: Right click on Install.exe Run as Admin & follow the prompts

antspants · Oct 28, 2025

Side note:

I don’t know if this is the same for all users but when I use Media Creation Tool to download an ISO, it seems to always wants to save it in “Documents” just in case you can’t find it in your “Downloads” folder.

And…

The reason you use Media Creation Tool to download the ISO, is because MCT always offers the more up to date ISO than a direct download from Microsoft

caitlou · Oct 28, 2025

antspants said:
All good.

Download the ISO using Media Creation Tool (Option One)

When Media Creation Tool asks if you want to create a usb or just get the ISO: Choose ISO

When it is finished downloading, right click on the ISO and select “Mount” at the top of the context menu

Or just follow Option Two in the In-Place tutorial

Go to the mounted ISO in File Explorer: Right click on Install.exe Run as Admin & follow the prompts

Thank you! I do this, and it goes to a blue screen installing windows 11 - it downloads for ages, gets to about 75% then I get a pop up from windows 11 setup saying windows 11 installation has failed - any idea why?

antspants · Oct 28, 2025

Two things to try:

Disable Fast Startup
Also,“Temporarily” disable secure boot in your BIOS. Turn it back on after update.

How to Disable Fast Startup in Windows 11
Fast Startup can cause issues with dual-boot setups, device drivers, or system updates.

Open Control Panel

Press Win + R, type control, and press Enter.
Navigate to Power Options

Go to System and Security > Power Options.
Access Shutdown Settings

Click Choose what the power buttons do from the left pane.
Unlock Grayed-Out Options

Click Change settings that are currently unavailable (requires admin rights).
Disable Fast Startup

Uncheck Turn on fast startup (recommended) under Shutdown settings.
Save Changes

Click Save changes and close the window.
Reboot

During reboot, enter the BIOS and disable Secure Boot

antspants · Oct 28, 2025

You could try the above and then try Windows Update as apposed to the In-Place upgrade, just to see if the update works in Windows Update.

antspants · Oct 28, 2025

Edited post 10 (Added 7. Reboot. And advice to disable Secure Boot)

zbook · Oct 28, 2025

What are the status of important files?

If there are no important files then clean install the desired edition / version

If there are important files then custom install the desired edition / version

If you prefer to troubleshoot instead of reinstalling drivers and applications then run scripts and post share links for troubleshooting.

Indicate your preference and links will be posted.

Windows 11 Update 23H2 Error 0x800705b9

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