MDT Tutorial Part 11: Troubleshooting Part 6: Unable to mount the WIM, so the update process cannot continue

Living Table of Contents

 

What These Guides Are:
A guide to help give you some insight into the troubleshooting process in general.

What These Guides Are Not:
A guide to fix all issues you’re going to encounter.

We’re going to role-play a bunch of scenarios and try to work through them.  Remember in math where you had to show your work?  Well, what follows is like that which is why this post is [more than] a [little] lengthy.

Unable to mount the WIM, so the update process cannot continue

When updating your deployment share it fails almost immediately with error Unable to mount the WIM, so the update process cannot continue.

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Error Text:


=== Making sure the deployment share has the latest x86 tools ===

=== Processing LiteTouchPE (x86) boot image ===

Building requested boot image profile.
Determining if any changes have been made in the boot image configuration.
No existing boot image profile found for platform x86 so a new image will be created.
Calculating hashes for requested content.
Changes have been made, boot image will be updated.
Windows PE WIM C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\Windows Preinstallation Environment\x86\en-us\winpe.wim will be used.
Unable to mount the WIM, so the update process cannot continue.

=== Completed processing platform x86 ===

=== Making sure the deployment share has the latest x64 tools ===

=== Processing LiteTouchPE (x64) boot image ===

Building requested boot image profile.
Determining if any changes have been made in the boot image configuration.
No existing boot image profile found for platform x64 so a new image will be created.
Calculating hashes for requested content.
Changes have been made, boot image will be updated.
Windows PE WIM C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\Windows Preinstallation Environment\amd64\en-us\winpe.wim will be used.
Unable to mount the WIM, so the update process cannot continue.

=== Completed processing platform x64 ===

=== Processing complete ===

You might try a variety of things like:

  • Use DISM to get-wiminfo to confirm the WIMs are OK
  • Bounce the MDT machine
  • Perform a repair installation of the ADK
  • Use DISM to mount the WIM manually and you get an error 577

We talked about this in Part 2 : Did you remember to patch the ADK?  🙂

Copypasta Closing

Hopefully these examples will help give you an idea of the overall troubleshooting process.  Most of the time the problems you’ll encounter will be caused by a typso, order of operations or a ‘known issue’ that requires a specific process to be followed.

As you make changes to your environment, here’s what I recommend:

  • Be diligent about keeping a change log so you can easily backtrack
  • Backup your CS.INI or Bootstrap.ini before you make any changes
  • Backup your ts.xml or unattend.xml (in DeploymentShare\Control\TaskSequenceID) before you make any changes
  • Introduce small changes at time with set checkpoints in between and set milestones markers where you backup core files (e.g cs.ini bootstrap.ini ts.xml unattend.xml etc) to help minimize frustration troubleshooting.

And if when you do run into some turbulence, upload relevant logs (at least smsts.log but be prepared to submit others depending on the issue) to a file sharing service like OneDrive, post on TechNet then give a shout to your resources on Twitter.

Good Providence to you!

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