# Can't find PLC Online. AS 4.9

**URL:** <https://community.br-automation.com/t/cant-find-plc-online-as-4-9/6238>\
**Category:** B&R Software & Runtime\
**Tags:** automation-studio, automation-runtime, plc\
**Created:** [March 15, 2025, 11:55am UTC](https://community.br-automation.com/t/cant-find-plc-online-as-4-9/6238 "2025-03-15T11:55:31Z")\
**Posts on this page:** 1\
**Showing post:** 16

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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:** [March 18, 2025, 7:45am UTC](https://community.br-automation.com/t/cant-find-plc-online-as-4-9/6238/16 "2025-03-18T07:45:13Z")

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> [@Szafa01](#):
>
> my Upgrade service won’t start. After trying to trigger it in services.msc i get a Windows error 3 saying the system cannot find the path specified.

Again some tips from our conversational help:

* * *

To resolve the issue where the B&R Upgrades Service fails to start and you receive a Windows error 3 stating “the system cannot find the path specified,” follow these steps:

1. **Check Service Path:**

- Open the Windows Services management console by pressing **Win + R** , typing `services.msc`, and pressing **Enter**.
- Locate the B&R Upgrades Service (specific to your Automation Studio version, e.g., AS412).
- Right-click on the service and select **Properties**.
- In the **General** tab, check the **Path to executable**. Ensure that the path specified is correct and that the executable file exists at that location.

1. **Correct the Service Path:**

- If the path is incorrect or the executable is missing, you may need to reinstall the B&R Upgrades Service or correct the path manually.
- Navigate to the installation directory of Automation Studio and verify the presence of the upgrade service executable.

1. **Check for Missing Files:**

- Ensure that all necessary files for the upgrade service are present in the installation directory. Missing files can cause the service to fail to start.

1. **Run as Administrator:**

- Ensure that you have the necessary permissions to start the service. Right-click on the Automation Studio shortcut and select **Run as administrator**.

1. **Check System Updates:**

- Ensure that your Windows system is up to date. Sometimes, missing system updates can cause services to fail.

1. **Review Event Viewer Logs:**

- Open the Event Viewer by pressing **Win + R** , typing `eventvwr`, and pressing **Enter**.
- Navigate to **Windows Logs \> System** and look for any error messages related to the B&R Upgrades Service. This can provide more detailed information about why the service is failing to start.

By following these steps, you should be able to resolve the issue with the B&R Upgrades Service and successfully start it to install upgrades in Automation Studio. If the problem persists, consider reaching out to B&R support for further assistance.

## Further Information:

- [Upgrade services does not work](https://community.br-automation.com/t/3039)
- [Upgrade service](https://community.br-automation.com/t/2930)

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