# Guide to Zero-Touch OS Updates | Hexnode UEM Implementation

In a 500,000-device fleet, “User Discretion” is a security vulnerability. If an employee clicks “Remind Me Tomorrow” on a critical patch, the organization remains exposed. **Zero-Touch OS Updates** via **Hexnode UEM** shifts the paradigm from user-dependent requests to IT-enforced compliance. By entirely removing the human variable from the equation, Hexnode allows IT administrators to orchestrate the complete update lifecycle from silent background downloads to mandatory off-peak reboots across Windows, macOS, Android, and iOS ecosystems.

This document outlines the foundational logic, verified cross-platform workflows, and critical scalability guardrails required to implement a true Zero-Touch patching framework, ensuring absolute fleet compliance without requiring a single click from the end-user.

1. The Logic: Force-and-Verify
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Zero-Touch updates replace passive notifications with a proactive, automated workflow.

- **Discovery:** Hexnode scans the fleet to identify devices trailing the “Approved Version.”
- **Staging:** UEM commands devices to download updates in the background.
- **Enforcement:** UEM triggers mandatory installation during a pre-defined window.
- **Verification:** The device reports its new OS version string, closing the compliance loop.

2. Implementation Workflow
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### A. Windows (Patches & Updates)

- **Policy Path:** Policies > New Policy > Windows > Patches & Updates > [Windows Update Experience](https://www.hexnode.com/mobile-device-management/help/configure-windows-update-end-user-experience/)
- **Automatic Update Behavior:** Select **Disable user control, auto install and restart at a specified time**.
- **Schedule:** Set your **Install Day** and **Install Time** (e.g., Tuesday at 03:00).
- **Enforcement:** Enable **Skip restart checks** and **Disable pause updates**.

### B. macOS (Software Preferences & OS Updates)

- **Set the Preferences:** Go to Policies > macOS > Patches & Updates > [Software Update Preferences.](https://www.hexnode.com/mobile-device-management/help/configure-macos-software-update-preferences-with-hexnode/) Ensure update deferrals are disabled (0 days) and enable **Automatically install critical updates** to silently apply Apple Rapid Security Responses (RSR).
- **Force the Execution:** In the same policy, go to macOS > Security > [OS Updates.](https://www.hexnode.com/mobile-device-management/help/how-to-schedule-macos-updates-using-hexnode-mdm/) Set the action to **Download and Install** to bypass user prompts and trigger the installation immediately.

### C. Android (System Update Policy)

- **Path:** Policies > Android > Enterprise > Security > [OS Updates.](https://www.hexnode.com/mobile-device-management/help/how-to-schedule-os-updates-in-android-devices-using-hexnode/)
- **Constraint:** Requires **Device Owner (Android Enterprise)** mode.
- **Setting:** Choose **Update automatically**.
- **Silent Execution:** For non-Enterprise/Legacy devices, the **Hexnode System Agent** must be pre-installed as a system app to bypass user prompts.

3. Comparison: Manual vs. Zero-Touch
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FeatureManual Updates (Legacy)Zero-Touch Updates (Hexnode)**User Intervention**Required (High friction)None (Policy-enforced)**Compliance Rate**Variable (80–85%)Target 100%**Vulnerability Gap**High (Days/Weeks)Minimal (Hours)**Network Impact**Unpredictable SpikesManaged (Maintenance Windows)4. Scalability Guardrails
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- **Bandwidth Control:** Optimize bandwidth by enforcing **Windows Delivery Optimization (P2P)** via [PowerShell script](https://www.hexnode.com/mobile-device-management/help/executing-custom-scripts-for-windows/) and enabling the [‘Content Caching](https://www.hexnode.com/mobile-device-management/help/macos-mdm-restrictions/#:~:text=Content%20caching,will%20be%20disabled.)‘ restriction for macOS to leverage local Caching Servers.
- **Battery Safety:** iOS and Android updates generally fail if battery is 50%. Ensure your maintenance window coincides with expected charging cycles (e.g., 02:00–05:00).
- **Freeze Periods:** Use **Update Deferrals** (up to 90 days) for [iOS](https://www.hexnode.com/mobile-device-management/help/how-to-delay-ios-updates-on-ios-11-3-devices-using-hexnode/)/[macOS](https://www.hexnode.com/mobile-device-management/help/configure-macos-software-update-preferences-with-hexnode/#defer-software-updates) to ensure major OS jumps don’t break mission-critical apps during peak business cycles.