# What happens when existing devices are rediscovered?

Rediscovery can be performed by the following methods:

1. **Device specific:**  
   When you have individual devices that need to be rediscovered,

   1. Go to **Inventory**, and click on the device.
   2. In the **Device Snapshot** page, select the **Rediscover Device** option from the Menu.
   3. In the following screen that appears, choose the appropriate **Credentials** and click on the **Rediscover Now** option.

2. **Discovery Profile:**  
   You can perform rediscovery on a large number of devices from **Discovery Profile**.

   For OpManager versions below `125174`:

   1. Go to **Settings > Discovery** and choose Existing Devices.
   2. Select the devices/group/business view that needs to be rediscovered.
   3. Select the Credentials and navigate further to assign Rules or associate Interfaces.
   4. Schedule the profile or click on **Save and Execute** to initiate rediscovery.

   ![Existing devices rediscovered in OpManager: Existing devices](https://www.manageengine.com/network-monitoring/faq/images/existing-devices-1.PNG)

   For OpManager versions `125174` and above:

   1. Go to **Settings > Network Discovery** and click on the **Rediscovery** tab.
   2. Click on the **Rediscover Devices** option, select the devices/group/business view that needs to be rediscovered and select the required **Credentials**.
   3. Schedule the profile by clicking on the **Schedule** option or save and initiate the process by clicking on the **Save** option.

## Unknown Devices

When existing devices are discovered as Unknown, choose the proper credential on rediscovery and they will be associated with the appropriate device template, provided the SysOID of the device matches with any of the existing or custom device template.

**Note:** Custom edits made to the devices will not be removed during ReDiscovery. However, RAM, Interface, Device Profile and HDD information will be updated.