Sync Never Started Even with Correct Settings After Upgrade? Here’s How to Fix It

After upgrading your device, you may notice that data synchronization never begins—even though all settings appear to be correct. This issue can be confusing because everything seems properly configured, yet your contacts, photos, messages, or app data fail to sync.

In most cases, this problem is caused by hidden system changes during the upgrade, such as disabled background services, expired authentication tokens, or system-level restrictions that prevent synchronization from initiating.

Quick Answer

If synchronization never starts after a device upgrade despite correct settings, the most common causes include expired account authentication, disabled background data, system optimization restrictions, pending server communication, or corrupted sync services. Addressing these factors usually restores normal syncing.

Why Sync Never Starts After an Upgrade

1. Expired Account Authentication

Device upgrades often invalidate authentication tokens. Even if you appear to be logged in, the system may require re-authentication before synchronization can begin.

2. Background Data Restrictions

Operating system updates may reset background data permissions, preventing apps from initiating synchronization processes.

3. Battery Optimization Settings

New system optimization features can limit background activities to preserve battery life, unintentionally blocking sync services.

4. Corrupted Sync Services

During an upgrade, system components responsible for synchronization may become corrupted or fail to initialize properly.

5. Server Communication Delays

After a major update, the device may take time to re-establish communication with cloud servers, delaying the start of synchronization.

6. Pending System Updates

Additional patches or app updates may be required for full compatibility with the new operating system.

Step-by-Step Solutions

Step 1: Re-authenticate Your Account

Sign out of your account and sign back in to refresh authentication tokens and re-enable synchronization.

Step 2: Enable Background Data

Ensure that background data usage is allowed for the affected application.

• Android: Settings > Apps > [App Name] > Mobile Data & Wi-Fi > Enable Background Data.
• iOS: Settings > General > Background App Refresh > Enable for the relevant app.

Step 3: Disable Battery Optimization

Exclude the app from battery optimization to allow uninterrupted synchronization.

• Android: Settings > Battery > Battery Optimization > Select the app and choose Don’t Optimize.

Step 4: Manually Trigger Synchronization

Open the app and use the manual sync option to initiate the process.

Step 5: Update the App and Operating System

Install any pending updates to ensure compatibility with the upgraded system.

Step 6: Restart the Device

A device restart can refresh system services and resolve temporary synchronization issues.

Step 7: Clear App Cache (Android)

Clearing cached data can resolve conflicts preventing synchronization.

1. Go to Settings > Apps.
2. Select the affected application.
3. Tap Storage and choose Clear Cache.

Signs the Issue Is Resolved

• The synchronization process begins shortly after re-authentication.
• Recent data appears across all connected devices.
• Sync status indicators show active progress.
• No further sync-related warnings are displayed.

Prevention Tips

• Verify synchronization settings immediately after a device upgrade.
• Keep both the operating system and apps updated.
• Ensure sufficient storage and stable internet connectivity.
• Disable restrictive battery optimization for critical apps.
• Maintain regular cloud backups to safeguard your data.

Final Answer

If synchronization never starts after a device upgrade despite correct settings, the issue is typically caused by expired authentication, background data restrictions, battery optimization, or corrupted sync services. Re-authenticating your account and adjusting system permissions will usually resolve the problem.