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---
title: Log files and resolving upgrade errors
manager: dougeby
ms.author: aaroncz
description: Learn how to interpret and analyze the log files that are generated during the Windows 10 upgrade process.
ms.custom: seo-marvel-apr2020
ms.prod: w10
author: aczechowski
ms.localizationpriority: medium
ms.topic: article
ms.collection: highpri
---
# Log files
**Applies to**
- Windows 10
>[!NOTE]
>This is a 400 level topic (advanced).<br>
>See [Resolve Windows 10 upgrade errors](resolve-windows-10-upgrade-errors.md) for a full list of topics in this article.
Several log files are created during each phase of the upgrade process. These log files are essential for troubleshooting upgrade problems. By default, the folders that contain these log files are hidden on the upgrade target computer. To view the log files, configure Windows Explorer to view hidden items, or use a tool to automatically gather these logs. The most useful log is **setupact.log**. The log files are located in a different folder depending on the Windows Setup phase. Recall that you can determine the phase from the extend code.
>[!NOTE]
>Also see the [Windows Error Reporting](windows-error-reporting.md) section in this document for help locating error codes and log files.
The following table describes some log files and how to use them for troubleshooting purposes:<br>
|Log file |Phase: Location |Description |When to use|
|---|---|---|---|
|setupact.log|Down-Level:<br>$Windows.~BT\Sources\Panther|Contains information about setup actions during the downlevel phase. |All down-level failures and starting point for rollback investigations.<br> This is the most important log for diagnosing setup issues.|
|setupact.log|OOBE:<br>$Windows.~BT\Sources\Panther\UnattendGC|Contains information about actions during the OOBE phase.|Investigating rollbacks that failed during OOBE phase and operations 0x4001C, 0x4001D, 0x4001E, 0x4001F.|
|setupact.log|Rollback:<br>$Windows.~BT\Sources\Rollback|Contains information about actions during rollback.|Investigating generic rollbacks - 0xC1900101.|
|setupact.log|Pre-initialization (prior to downlevel):<br>Windows|Contains information about initializing setup.|If setup fails to launch.|
|setupact.log|Post-upgrade (after OOBE):<br>Windows\Panther|Contains information about setup actions during the installation.|Investigate post-upgrade related issues.|
|setuperr.log|Same as setupact.log|Contains information about setup errors during the installation.|Review all errors encountered during the installation phase.|
|miglog.xml|Post-upgrade (after OOBE):<br>Windows\Panther|Contains information about what was migrated during the installation.|Identify post upgrade data migration issues.|
|BlueBox.log|Down-Level:<br>Windows\Logs\Mosetup|Contains information communication between setup.exe and Windows Update.|Use during WSUS and Windows Update down-level failures or for 0xC1900107.|
|Supplemental rollback logs:<br>Setupmem.dmp<br>setupapi.dev.log<br>Event logs (*.evtx)|$Windows.~BT\Sources\Rollback|Additional logs collected during rollback.|Setupmem.dmp: If OS bug checks during upgrade, setup will attempt to extract a mini-dump.<br>Setupapi: Device install issues - 0x30018<br>Event logs: Generic rollbacks (0xC1900101) or unexpected reboots.|
## Log entry structure
A setupact.log or setuperr.log entry (files are located at C:\Windows) includes the following elements:
1. **The date and time** - 2016-09-08 09:20:05.
2. **The log level** - Info, Warning, Error, Fatal Error.
3. **The logging component** - CONX, MOUPG, PANTHR, SP, IBSLIB, MIG, DISM, CSI, CBS.
The logging components SP (setup platform), MIG (migration engine), and CONX (compatibility information) are particularly useful for troubleshooting Windows Setup errors.
4. **The message** - Operation completed successfully.
See the following example:
| Date/Time | Log level | Component | Message |
|------|------------|------------|------------|
|2016-09-08 09:23:50,| Warning | MIG | Could not replace object C:\Users\name\Cookies. Target Object cannot be removed.|
## Analyze log files
The following instructions are meant for IT professionals. Also see the [Upgrade error codes](upgrade-error-codes.md) section in this guide to familiarize yourself with [result codes](upgrade-error-codes.md#result-codes) and [extend codes](upgrade-error-codes.md#extend-codes).
To analyze Windows Setup log files:
1. Determine the Windows Setup error code. This code should be returned by Windows Setup if it is not successful with the upgrade process.
2. Based on the [extend code](upgrade-error-codes.md#extend-codes) portion of the error code, determine the type and location of a [log files](#log-files) to investigate.
3. Open the log file in a text editor, such as notepad.
4. Using the [result code](upgrade-error-codes.md#result-codes) portion of the Windows Setup error code, search for the result code in the file and find the last occurrence of the code. Alternatively search for the "abort" and abandoning" text strings described in step 7 below.
5. To find the last occurrence of the result code:
1. Scroll to the bottom of the file and click after the last character.
2. Click **Edit**.
3. Click **Find**.
4. Type the result code.
5. Under **Direction** select **Up**.
6. Click **Find Next**.
6. When you have located the last occurrence of the result code, scroll up a few lines from this location in the file and review the processes that failed just prior to generating the result code.
7. Search for the following important text strings:
* **Shell application requested abort**
* **Abandoning apply due to error for object**
8. Decode Win32 errors that appear in this section.
9. Write down the timestamp for the observed errors in this section.
10. Search other log files for additional information matching these timestamps or errors.
For example, assume that the error code for an error is 0x8007042B - 0x2000D. Searching for "8007042B" reveals the following content from the setuperr.log file:
Some lines in the text below are shortened to enhance readability. The date and time at the start of each line (ex: 2016-10-05 15:27:08) is shortened to minutes and seconds, and the certificate file name which is a long text string is shortened to just "CN."
**setuperr.log** content:
```console
27:08, Error SP Error READ, 0x00000570 while gathering/applying object: File, C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18 [CN]. Will return 0[gle=0x00000570]
27:08, Error MIG Error 1392 while gathering object C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18 [CN]. Shell application requested abort![gle=0x00000570]
27:08, Error Gather failed. Last error: 0x00000000
27:08, Error SP SPDoFrameworkGather: Gather operation failed. Error: 0x0000002C
27:09, Error SP CMigrateFramework: Gather framework failed. Status: 44
27:09, Error SP Operation failed: Migrate framework (Full). Error: 0x8007042B[gle=0x000000b7]
27:09, Error SP Operation execution failed: 13. hr = 0x8007042B[gle=0x000000b7]
27:09, Error SP CSetupPlatformPrivate::Execute: Execution of operations queue failed, abandoning. Error: 0x8007042B[gle=0x000000b7]
```
The first line indicates there was an error **0x00000570** with the file **C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18 [CN]** (shown below):
```console
27:08, Error SP Error READ, 0x00000570 while gathering/applying object: File, C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18 [CN]. Will return 0[gle=0x00000570]
```
The error 0x00000570 is a [Win32 error code](/openspecs/windows_protocols/ms-erref/18d8fbe8-a967-4f1c-ae50-99ca8e491d2d) corresponding to: ERROR_FILE_CORRUPT: The file or directory is corrupted and unreadable.
Therefore, Windows Setup failed because it was not able to migrate the corrupt file **C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18\[CN]**. This file is a local system certificate and can be safely deleted. Searching the setupact.log file for additional details, the phrase "Shell application requested abort" is found in a location with the same timestamp as the lines in setuperr.log. This confirms our suspicion that this file is the cause of the upgrade failure:
**setupact.log** content:
```console
27:00, Info Gather started at 10/5/2016 23:27:00
27:00, Info [0x080489] MIG Setting system object filter context (System)
27:00, Info [0x0803e5] MIG Not unmapping HKCU\Software\Classes; it is not mapped
27:00, Info [0x0803e5] MIG Not unmapping HKCU; it is not mapped
27:00, Info SP ExecuteProgress: Elapsed events:1 of 4, Percent: 12
27:00, Info [0x0802c6] MIG Processing GATHER for migration unit: &lt;System&gt;\UpgradeFramework (CMXEAgent)
27:08, Error SP Error READ, 0x00000570 while gathering/applying object: File, C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18 [CN]. Will return 0[gle=0x00000570]
27:08, Error MIG Error 1392 while gathering object C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18 [CN]. Shell application requested abort![gle=0x00000570]
27:08, Info SP ExecuteProgress: Elapsed events:2 of 4, Percent: 25
27:08, Info SP ExecuteProgress: Elapsed events:3 of 4, Percent: 37
27:08, Info [0x080489] MIG Setting system object filter context (System)
27:08, Info [0x0803e5] MIG Not unmapping HKCU\Software\Classes; it is not mapped
27:08, Info [0x0803e5] MIG Not unmapping HKCU; it is not mapped
27:08, Info MIG COutOfProcPluginFactory::FreeSurrogateHost: Shutdown in progress.
27:08, Info MIG COutOfProcPluginFactory::LaunchSurrogateHost::CommandLine: -shortened-
27:08, Info MIG COutOfProcPluginFactory::LaunchSurrogateHost: Successfully launched host and got control object.
27:08, Error Gather failed. Last error: 0x00000000
27:08, Info Gather ended at 10/5/2016 23:27:08 with result 44
27:08, Info Leaving MigGather method
27:08, Error SP SPDoFrameworkGather: Gather operation failed. Error: 0x0000002C
```
**setupapi.dev.log** content:
```console
>>> [Device Install (UpdateDriverForPlugAndPlayDevices) - PCI\VEN_8086&DEV_8C4F]
>>> Section start 2019/09/26 20:13:01.623
cmd: rundll32.exe "C:\WINDOWS\Installer\MSI6E4C.tmp",zzzzInvokeManagedCustomActionOutOfProc SfxCA_95972906 484 ChipsetWiX.CustomAction!Intel.Deployment.ChipsetWiX.CustomActions.InstallDrivers
ndv: INF path: C:\WINDOWS\TEMP\{15B1CD41-69F5-48EA-9F45-0560A40FE2D8}\Drivers\lynxpoint\LynxPointSystem.inf
ndv: Install flags: 0x00000000
ndv: {Update Device Driver - PCI\VEN_8086&DEV_8C4F&SUBSYS_05BE1028&REV_04\3&11583659&0&F8}
ndv: Search options: 0x00000081
ndv: Searching single INF 'C:\WINDOWS\TEMP\{15B1CD41-69F5-48EA-9F45-0560A40FE2D8}\Drivers\lynxpoint\LynxPointSystem.inf'
dvi: {Build Driver List} 20:13:01.643
dvi: Searching for hardware ID(s):
dvi: pci\ven_8086&dev_8c4f&subsys_05be1028&rev_04
dvi: pci\ven_8086&dev_8c4f&subsys_05be1028
dvi: pci\ven_8086&dev_8c4f&cc_060100
dvi: pci\ven_8086&dev_8c4f&cc_0601
dvi: Searching for compatible ID(s):
dvi: pci\ven_8086&dev_8c4f&rev_04
dvi: pci\ven_8086&dev_8c4f
dvi: pci\ven_8086&cc_060100
dvi: pci\ven_8086&cc_0601
dvi: pci\ven_8086
dvi: pci\cc_060100
dvi: pci\cc_0601
sig: {_VERIFY_FILE_SIGNATURE} 20:13:01.667
sig: Key = lynxpointsystem.inf
sig: FilePath = c:\windows\temp\{15b1cd41-69f5-48ea-9f45-0560a40fe2d8}\drivers\lynxpoint\lynxpointsystem.inf
sig: Catalog = c:\windows\temp\{15b1cd41-69f5-48ea-9f45-0560a40fe2d8}\drivers\lynxpoint\LynxPoint.cat
sig: Success: File is signed in catalog.
sig: {_VERIFY_FILE_SIGNATURE exit(0x00000000)} 20:13:01.683
dvi: Created Driver Node:
dvi: HardwareID - PCI\VEN_8086&DEV_8C4F
dvi: InfName - c:\windows\temp\{15b1cd41-69f5-48ea-9f45-0560a40fe2d8}\drivers\lynxpoint\lynxpointsystem.inf
dvi: DevDesc - Intel(R) QM87 LPC Controller - 8C4F
dvi: Section - Needs_ISAPNP_DRV
dvi: Rank - 0x00ff2001
dvi: Signer Score - WHQL
dvi: DrvDate - 04/04/2016
dvi: Version - 10.1.1.18
dvi: {Build Driver List - exit(0x00000000)} 20:13:01.699
ndv: Searching currently installed INF
dvi: {Build Driver List} 20:13:01.699
dvi: Searching for hardware ID(s):
dvi: pci\ven_8086&dev_8c4f&subsys_05be1028&rev_04
dvi: pci\ven_8086&dev_8c4f&subsys_05be1028
dvi: pci\ven_8086&dev_8c4f&cc_060100
dvi: pci\ven_8086&dev_8c4f&cc_0601
dvi: Searching for compatible ID(s):
dvi: pci\ven_8086&dev_8c4f&rev_04
dvi: pci\ven_8086&dev_8c4f
dvi: pci\ven_8086&cc_060100
dvi: pci\ven_8086&cc_0601
dvi: pci\ven_8086
dvi: pci\cc_060100
dvi: pci\cc_0601
dvi: Created Driver Node:
dvi: HardwareID - PCI\VEN_8086&DEV_8C4F
dvi: InfName - C:\WINDOWS\System32\DriverStore\FileRepository\lynxpointsystem.inf_amd64_cd1e518d883ecdfe\lynxpointsystem.inf
dvi: DevDesc - Intel(R) QM87 LPC Controller - 8C4F
dvi: Section - Needs_ISAPNP_DRV
dvi: Rank - 0x00ff2001
dvi: Signer Score - WHQL
dvi: DrvDate - 10/03/2016
dvi: Version - 10.1.1.38
dvi: {Build Driver List - exit(0x00000000)} 20:13:01.731
dvi: {DIF_SELECTBESTCOMPATDRV} 20:13:01.731
dvi: Default installer: Enter 20:13:01.735
dvi: {Select Best Driver}
dvi: Class GUID of device changed to: {4d36e97d-e325-11ce-bfc1-08002be10318}.
dvi: Selected Driver:
dvi: Description - Intel(R) QM87 LPC Controller - 8C4F
dvi: InfFile - c:\windows\system32\driverstore\filerepository\lynxpointsystem.inf_amd64_cd1e518d883ecdfe\lynxpointsystem.inf
dvi: Section - Needs_ISAPNP_DRV
dvi: {Select Best Driver - exit(0x00000000)}
dvi: Default installer: Exit
dvi: {DIF_SELECTBESTCOMPATDRV - exit(0x00000000)} 20:13:01.743
ndv: Currently Installed Driver:
ndv: Inf Name - oem1.inf
ndv: Driver Date - 10/03/2016
ndv: Driver Version - 10.1.1.38
ndv: {Update Device Driver - exit(00000103)}
! ndv: No better matching drivers found for device 'PCI\VEN_8086&DEV_8C4F&SUBSYS_05BE1028&REV_04\3&11583659&0&F8'.
! ndv: No devices were updated.
<<< Section end 2019/09/26 20:13:01.759
<<< [Exit status: FAILURE(0xC1900101)]
```
This analysis indicates that the Windows upgrade error can be resolved by deleting the C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18\[CN] file.
> [!NOTE]
> In this example, the full, unshortened file name is C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18\be8228fb2d3cb6c6b0ccd9ad51b320b4_a43d512c-69f2-42de-aef9-7a88fabdaa3f.
## Related topics
[Windows 10 FAQ for IT professionals](../planning/windows-10-enterprise-faq-itpro.yml)
<br>[Windows 10 Enterprise system requirements](https://technet.microsoft.com/windows/dn798752.aspx)
<br>[Windows 10 Specifications](https://www.microsoft.com/windows/Windows-10-specifications)
<br>[Windows 10 IT pro forums](https://social.technet.microsoft.com/Forums/en-US/home?category=Windows10ITPro)
<br>[Fix Windows Update errors by using the DISM or System Update Readiness tool](/troubleshoot/windows-server/deployment/fix-windows-update-errors)