Can't update to 24H2

Alainikus · Monday at 2:53 PM

Hi, It's been going on like that for a while now. Whenever I try to install the 24H2 update from 23H2, it will download everything normally and PC will reboot into the update. But then the update will fail and Windows will revert back to 23H2 due to the failure. The error code is ''0xc1900101''. I am clueless on what to do, Microsoft has not done anything to fix this and I read elsewhere others have the same issue. What can I do myself to update my Windows installation to 24H2?

glasskuter · Monday at 3:22 PM

I believe that error indicates an incompatible driver. Using the upgrade failure log, you might be able to determine which one.
Depending on where in the install the failure occurs, the log can be in multiple places.

If no error message occurs, the following log files are created when an upgrade fails during installation before the computer restarts for the second time. You have to look at these logs to get an idea of what's causing the failure.

C:\$Windows.~BT\Sources\panther\setupact.log
C:\$Windows.~BT\Sources\panther\miglog.xml
C:\Windows\setupapi.log

[Windows 10:] C:\Windows\Logs\MoSetup\BlueBox.log
C:\Windows\inf\setupapi.app.log
C:\Windows\inf\setupapi.dev.log
C:\Windows\panther\PreGatherPnPList.log
C:\Windows\panther\PostApplyPnPList.log
C:\Windows\memory.dmp

The following log files are created when an upgrade fails, and then you restore the desktop:
C:\$Windows.~BT\Sources\panther\setupact.log
C:\$Windows.~BT\Sources\panther\miglog.xml
C:\$Windows.~BT\sources\panther\setupapi\setupapi.dev.log
C:\$Windows.~BT\sources\panther\setupapi\setupapi.app.log
C:\Windows\memory.dmp

The following log files are created when an upgrade fails, and the installation rollback is initiated:
C:\$Windows.~BT\Sources\Rollback\setupact.log
C:\$Windows.~BT\Sources\Rollback\setupact.err

Mine rolled back so I found my particular error in the last 2 logs.
If logfiles do not direct you to what caused the error, I advise anyone to not waste his time. Either stay where you are or Bite the bullet. back up your data, and do a clean install. 24h2 will have you chasing your tail for days.

Alainikus · Monday at 3:29 PM

glasskuter said:
I believe that error indicates an incompatible driver. Using the upgrade failure log, you might be able to determine which one.
Depending on where in the install the failure occurs, the log can be in multiple places.

If no error message occurs, the following log files are created when an upgrade fails during installation before the computer restarts for the second time. You have to look at these logs to get an idea of what's causing the failure.

C:\$Windows.~BT\Sources\panther\setupact.log
C:\$Windows.~BT\Sources\panther\miglog.xml
C:\Windows\setupapi.log

[Windows 10:] C:\Windows\Logs\MoSetup\BlueBox.log
C:\Windows\inf\setupapi.app.log
C:\Windows\inf\setupapi.dev.log
C:\Windows\panther\PreGatherPnPList.log
C:\Windows\panther\PostApplyPnPList.log
C:\Windows\memory.dmp

The following log files are created when an upgrade fails, and then you restore the desktop:
C:\$Windows.~BT\Sources\panther\setupact.log
C:\$Windows.~BT\Sources\panther\miglog.xml
C:\$Windows.~BT\sources\panther\setupapi\setupapi.dev.log
C:\$Windows.~BT\sources\panther\setupapi\setupapi.app.log
C:\Windows\memory.dmp

The following log files are created when an upgrade fails, and the installation rollback is initiated:
C:\$Windows.~BT\Sources\Rollback\setupact.log
C:\$Windows.~BT\Sources\Rollback\setupact.err

Mine rolled back so I found my particular error in the last 2 logs.
If logfiles do not direct you to what caused the error, I advise anyone to not waste his time. Either stay where you are or Bite the bullet. back up your data, and do a clean install. 24h2 will have you chasing your tail for days.

Where would I have to specifically look inside the logs to find the error? There is a lot of text.

glasskuter · Monday at 4:11 PM

Usually closer to the bottom, but it won't be the absolute bottom. You should find the first mention of the error code.
But these logfiles are in MS speak so they are most times as clear as mud.

zbook · 2025-06-24T13:21:06-0400

1) Please run the V2 log collector and post a share link into this thread using drop box, or google drive

BSOD - Posting Instructions | Windows 11 Forum (elevenforum.com)

Add, Remove, and Change Display Language in Windows 10

Change Display Language in Windows 10

2) Run: upgrade_failure_info > post a share link

https://www.tenforums.com/attachmen...s-use-bsod-debugging-upgrade_failure_info.bat

Batch files for use in BSOD debugging - Windows 10 Help Forums

Batch files for use in BSOD debugging - Windows 10 Help Forums

3) Run Tuneup plus > post a share link

https://www.tenforums.com/attachmen...-files-use-bsod-debugging-tuneup_plus_log.bat

Batch files for use in BSOD debugging - Page 2 - Windows 10 Forums

Batch files for use in BSOD debugging - Windows 10 Forums

4) Open administrative command prompt and copy and paste:

fltmc

schtasks.exe /Run /TN "\Microsoft\Windows\Application Experience\Microsoft Compatibility Appraiser"

reg query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\TargetVersionUpgradeExperienceIndicators" /s

dism /online /get-drivers /format:table >c:\drivers.txt

Post share links.

Alainikus · 2025-06-24T13:37:13-0400

glasskuter said:
Usually closer to the bottom, but it won't be the absolute bottom. You should find the first mention of the error code.
But these logfiles are in MS speak so they are most times as clear as mud.

I have an ''failed to merge telemetry file'' error, I found it in the logs. I have O&O ShutUp10++ installed which disables telemetry on windows. Could that be the issue?

glasskuter · 2025-06-24T13:39:41-0400

yes
Also uninstall anything that alters the GUI and disable any 3rd party AV

Alainikus · 2025-06-24T13:40:37-0400

glasskuter said:
yes

ill have to wait till i get another opportunity to update to 24h2, but thanks ill try that

zbook · 2025-06-24T15:14:50-0400

Alainikus said:
Hi, It's been going on like that for a while now. Whenever I try to install the 24H2 update from 23H2, it will download everything normally and PC will reboot into the update. But then the update will fail and Windows will revert back to 23H2 due to the failure. The error code is ''0xc1900101''.

This problem can be troubleshooted or you can:
a) manually backup files and clean install
b) have Windows backup files and clean install
c) reset save files
d) custom install
etc.

If you want to troubleshoot then see the steps in the earlier post.

Links can be posted for options a, b, c, and d.

XxXxX · 2025-06-24T16:02:50-0400

some times going into safe mode using the Windows 11 ISO to perform the Win 11 upgrade works
its a method i have had better success with then most other ways.

best of luck, Steve ..

Alainikus · 2025-06-24T16:04:40-0400

XxXxX said:
some times going into safe mode using the Windows 11 ISO to perform the Win 11 upgrade works
its a method i have had better success with then most other ways.

best of luck, Steve ..

would i keep all of my files doing this procedure? and do you mean genuinely using an ISO or using the installation assistant? I just tried doing the installation assistant while having my anti telemetry software uninstalled. And it still didn't work.

Alainikus · 2025-06-24T21:19:38-0400

Been trying all kinds of ways, none of them worked. Even followed official Microsoft troubleshooting documentation. Didn't work either, I guess I'll have to do an backup with an external drive. Thanks for all the help guys.

Alainikus · 2025-06-25T08:30:27-0400

So I have now tried to create a recovery image on an external SSD. However it tells me certain system files are missing and therefore the backup cannot be created. It asks me to use the ISO and such to fix this, but it will just lead to me just crashing during the update. I am even locked out of making an backup, what can I do?

XxXxX · 2025-06-25T09:14:38-0400

backup your data that you want to keep make a list of installed programs
and then do a clean install of Windows 11, many have had to do similar.

bets of luck, Steve ..

Can't update to 24H2

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