---
title: "Installation downgrade procedure for Trellix DLP Network Prevent"
slug: "installation-downgrade-procedure-for-trellix-dlp-network-appliances"
updated: 2026-11-04T05:24:16Z
published: 2026-11-04T05:24:16Z
canonical: "docs.trellix.com/installation-downgrade-procedure-for-trellix-dlp-network-appliances"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.trellix.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Installation downgrade procedure for Trellix DLP Network Prevent

There is no direct rollback or downgrade mechanism supported for DLP Network Prevent. Reverting to an earlier release requires a complete re-installation of the appliance ISO/OVA, re-registration with Trellix ePO, and a manual extension downgrade on the Trellix ePO server.

## Prerequisites and data backup

1. **Back Up ePO policies**: Export all DLP Appliance Management and Common Appliance Management policies, and policy assignments, through Trellix ePO to prevent configuration loss.
2. **Download Required Bundles**: Ensure you have the target/compatible version of both:

- The DLP Appliance ISO/OVA package.
- The compatible DLP Appliance Management Extension .zip bundle for Trellix ePO.

### Task

1. **Downgrade the ePO Extensions**: Perform this on the ePO server console.
  1. Log in to the Trellix ePO console and navigate to **Menu** → **Software** → **Extensions**.
  2. Select the existing **DLP Appliance Management Extension** and click **Remove**.
  3. Click **Install Extension** and select the target compatible .zip extension bundle.
  4. Install the required extensions in order:
    - Common UI Package
    - Appliance Management Extension
    - DLP Appliance Management Extension
  5. Confirm the lower version extension displays properly under the Extensions list.
2. **Reinstall the DLP Appliance software**: Complete system wipe and fresh installation.
  1. Boot the DLP Appliance using the target version ISO image or deploy a fresh virtual machine using the target OVA file.
  2. Access the **Upgrade / Installation** Menu from the console/SSH interface.
  3. Select the re-installation option (Option 5: Reinstall without retaining configuration).
  4. Complete the OS installation and reboot the appliance.
3. **Re-register appliance and restore configuration**: Connect appliance back to Trellix ePO.
  1. Access the appliance local console menu and run the **Setup Wizard**.
  2. Provide the ePO server IP/hostname, credentials, and port details to re-register the appliance with Trellix ePO.
  3. In the ePO console, verify that the appliance appears in the **System Tree** and shows healthy communication under **Appliance Management**.
  4. Re-assign or import your backed-up policies and push them to the reinstalled appliance.