> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/smb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/smb/site-configuration/assign-a-controller-to-a-site/controller-replacement.md).

# Controller Replacement

The controller replacement process ensures that **all existing data** is transferred to the new unit automatically.   The controller replacement is only required if the current SMB Controller is faulty.  Please ensure the new controller is online before the process is initiated.

* On the customer site, open the **Controller** lightbox and click **REPLACE**.

* Replace by either:
  * **Scanning QR Code**: Click **Scan controller QR code**, scan the QR printed on the controller (use phone photo if on a laptop), then click **NEXT**.
  * **Entering Controller ID**: Type the ID (printed below the QR code) into the **Controller ID** field, then click **NEXT**.

* A loading spinner will show data transfer progress.

* Upon success, a confirmation screen appears stating: 

*Your controller has been replaced!  All previous data has been transferred onto this new controller.*


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