# DTM Troubleshooting Guide

**URL:** <https://community.br-automation.com/t/dtm-troubleshooting-guide/11285>\
**Category:** How-To & Wikis\
**Tags:** dtm\
**Created:** [May 19, 2026, 9:57am UTC](https://community.br-automation.com/t/dtm-troubleshooting-guide/11285 "2026-05-19T09:57:32Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![xabier.zaldua](https://avatars.discourse-cdn.com/v4/letter/x/FF8800/32.png) [@xabier.zaldua](https://community.br-automation.com/u/xabier.zaldua)\
**Post date:** [May 19, 2026, 9:57am UTC](https://community.br-automation.com/t/dtm-troubleshooting-guide/11285/1 "2026-05-19T09:57:32Z")

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This guide covers known solutions for B+R DTM modules and the DTM library. If you’re experiencing issues with DTM on your PC, this information may help.

**Latest B+R DTM Download:** [B&R DTM | B&R Industrial Automation](https://www.br-automation.com/es-es/descargar/software/dtm/br-dtm/)

# **General Limitations**

See the [official documentation](https://help.br-automation.com/#/en/6/communication/fieldbuses/netx/netx_limitations.html) for complete details.

**Important Incompatibility:** [SYCON.net](http://SYCON.net) is not compatible with the Hilscher DTM library and cannot be installed on the same PC.

## **.NET Framework 3.5**

If DTM functions aren’t working properly, enable .NET Framework 3.5 in Windows Features. Follow the [Microsoft guide](https://learn.microsoft.com/en-us/dotnet/framework/install/dotnet-35-windows#enable-net-framework-35-on-windows) for activation.

 ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/b/b60d99d6989bbfb3a6daee655fc65c195acd1a20.png)

# **Automation Studio \< 4.12 and DTM 2.x**

DTM 2.x is fully supported with Automation Studio 4.12 and newer versions. Older AS versions may experience compatibility issues.

**Recommendation:** Migrate from AS4 to AS6 for full DTM 2.x support.

**Workaround:** Revert to DTM 1.x by uninstalling all Hilscher software products (especially “Device Library”), then reinstalling the latest DTM 1.x version. Note that DTM 1.x is not officially tested with AS 6.5, but based on functional compatibility, it should work.

**Additional Note:** Automation Studio versions below 4.12 are not supported on Windows 11. Consider using Windows 10 for older AS versions.

## **Region/Language Settings**

Unusual Windows Region/Language settings may cause DTM issues. Try switching to English to resolve the problem.

## **Complete DTM Removal and Reinstallation**

If you need a clean DTM installation:

1. Uninstall all DTM installations via Windows functions

2. Ensure nothing from Hilscher is still installed (check for “DTM” and “hilscher” in the apps)

3. Delete the folder “SYCONNet” from C:\ProgramData

4. Delete the folder “Hilscher GmbH” from C:\Program Files (x86)

5. Take a look at the Registry (“regedit”) if Hilscher got deleted within “Computer\HKEY\_LOCAL\_MACHINE\SOFTWARE\WOW6432Node\Hilscher GmbH”

6. Grant the user FULL Admin Rights

7. Reinstall latest DTM version. This time the registry should contain Device library and DTMs:

8. If above visible entries are NOT here the installation failed (please note that the amount of “kryptic” entries can vary but at least a few must be available)

9. Start AS and the errors should be gone (probably you have to delete the NetX/DTM card and reenter it again)

If you still have problems during the deinstallation of B+R DTM you can try using Revo Uninstaller Tool. This helps for other colleagues: [DTM Library can not be uninstalled - #9 by rafael.laury](https://community.br-automation.com/t/dtm-library-can-not-be-uninstalled/5945/9)

 ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/6/62b8f1b52a111cc9ac429e8ab6e6330f3e2f399a.png)

Free version can be downloaded here: [Download Revo Uninstaller Freeware - Free and Full Download](https://www.revouninstaller.com/start-freeware-download/)

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**Author:** ![valerio.manenti](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/valerio.manenti/32/11712_2.png) [@valerio.manenti](https://community.br-automation.com/u/valerio.manenti)\
**Post date:** [May 19, 2026, 12:58pm UTC](https://community.br-automation.com/t/dtm-troubleshooting-guide/11285/2 "2026-05-19T12:58:26Z")

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Thanks so much for the post @xabier.zaldua ,  
just small note about point 1) and 2)

From Rafael: “Hi all, I want to confirm that the resolution provided by @alexanderstieglbauer worked for another customer to successfully uninstall AS and DTM when they were getting errors attempting to uninstall from “Add or Remove Programs”. The Revo Uninstaller Tool free version can be downloaded here: [https://www.revouninstaller.com/start-freeware-download/](https://www.revouninstaller.com/start-freeware-download/ "Follow link")”

[DTM Library can not be uninstalled - Ask Questions / B&R Software & Runtime - B&R Community](https://community.br-automation.com/t/dtm-library-can-not-be-uninstalled/5945/9)

Ciao  
Valerio

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<div class="post-metadata">

**Author:** ![xabier.zaldua](https://avatars.discourse-cdn.com/v4/letter/x/FF8800/32.png) [@xabier.zaldua](https://community.br-automation.com/u/xabier.zaldua)\
**Post date:** [May 19, 2026, 1:37pm UTC](https://community.br-automation.com/t/dtm-troubleshooting-guide/11285/3 "2026-05-19T13:37:11Z")

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Thanks for the comment Valerio! I add this information to the post 🙂

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**Author:** ![kovarj](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/kovarj/32/537_2.png) [@kovarj](https://community.br-automation.com/u/kovarj)\
**Post date:** [May 21, 2026, 7:04am UTC](https://community.br-automation.com/t/dtm-troubleshooting-guide/11285/4 "2026-05-21T07:04:03Z")

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This is cool wiki post, thanks for sharing 😉