> For the complete documentation index, see [llms.txt](https://wiki.inels.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.inels.com/inels-bus/how-to-get-started/reset-central-units/factory-reset-of-cu3-01m-and-cu3-02m.md).

# Factory Reset of CU3-01M & CU3-02M

### **Factory Reset Procedure (CU3-01M & CU3-02M)**

1. **Power Cycle the CU**
   * Turn off the CU (remove power briefly).
   * Prepare to press the buttons before powering it back on.
2. **Initiate Factory Reset During Power-Up**
   * As you power the CU back **on**, immediately press and **hold three buttons together:**\
     **UP + RIGHT + DOWN**
   * Continue holding until the display shows the **Factory Reset option**.
3. **Confirm Factory Reset**
   * The display will prompt you to confirm the reset — follow the on-screen instructions.
   * Once confirmed, the CU will begin resetting itself.
4. **During Reset, Connect iDM for Firmware Update**
   * While the reset process is running, Display shows connect to iDM. 
   * **Connect the CU to your PC via LAN**.
   * Make sure your PC and CU are directly connected using a network cable.
   * Open iDM and connect to CU using default IP and CU addresss. 

{% hint style="info" %}
**Default IP and Network Setup After Reset**

* After reset completes, the CU will revert to default network settings:\
  ➤ **CU IP: `192.168.1.1`**
* Set your PC’s LAN adapter to a compatible IP in the same subnet, e.g.:\
  ➤ **PC IP: `192.168.1.10`**\
  ➤ **Subnet Mask: `255.255.255.0`**

**Connect iDM3 to CU**

* Open **iDM3** on your PC.
* Connect to the CU using:\
  **IP: `192.168.1.1`**\
  **CU Address (default — check label/project if changed)**
  {% endhint %}

5. **Update Firmware**

* Use iDM3 to perform a firmware update while the CU is in reset state.
* This ensures the unit boots with the correct firmware after reset.

> ### **Important Points**
>
> Factory reset clears **all configuration and project settings** in the CU.\
> After reset, the CU’s IP is **192.168.1.1** and must be reachable from your PC.\
> Network must be set manually on your PC to match the CU IP range for iDM3 to connect.\
> Always update firmware immediately after reset to ensure proper system behavior.


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