If you are using the latest 5UF VPN app, long-term connection failure is usually uncommon.

If the VPN cannot connect, the Connect button does nothing, or the speed feels slow, use the steps below to check the issue quickly.

1. What if tapping Connect does nothing?

This is usually not caused by the server itself. In most cases, the app was denied VPN permission the first time it asked the system to create the VPN connection.

The fastest solution is to reinstall the app.

• Uninstall the current app
• Install the latest 5UF VPN app again
• When you tap Connect again, allow the system to create the VPN connection

If the first permission request was denied, the system often will not properly trigger the VPN authorization flow again, so reinstalling is usually the fastest and simplest solution.

2. What if the VPN connects but the speed is slow?

The latest app already includes built-in speed testing and app availability checks on the home page, so you can evaluate the current network condition before switching servers blindly.

• You can test latency for servers in different countries from the home page
• In general, a result of under 1 second is considered relatively normal
• After switching to another server, the app can test again so you can compare quickly
• The app also checks availability for major services such as TikTok
• It can also help you identify which service region the current server is closer to, such as Japan or Hong Kong

These tools help you quickly understand whether the problem is caused by the current server, your current network environment, or the service you are trying to use.

3. What if the issue still cannot be solved?

If you already tested and the VPN is still slow, cannot connect, or you are not sure how to judge the result, use the built-in ticket feature in the latest app and contact support directly.

• Open the support ticket section in the latest app
• At the bottom of each ticket page, you will see related action buttons
• Send the test results to support
• Our support team can use your speed test, app availability test, and network diagnostic results to identify the issue faster

The ticket system now supports better email and push notifications, making it easier for us to contact you and solve the issue more quickly.

Recommendation: when you run into a problem, start with the built-in speed test, app availability check, and ticket feedback tools in the latest 5UF VPN app. This is usually faster and more accurate than describing the problem manually.

If TikTok still shows a black screen, fails to load, or redirects to Douyin even after you connect to a VPN, the problem is usually not just the IP address. TikTok also checks your current phone and network environment.

We recommend using the latest 5UF VPN app.

Quick setup:

1. Fully close TikTok first.
2. Turn on Airplane Mode and wait a few seconds.
3. While Airplane Mode is on, manually turn Wi-Fi back on.
4. Open the 5UF VPN app and connect to an available server.
5. After the VPN is connected, open TikTok.
6. Once TikTok loads normally, you can usually turn off Airplane Mode and return to normal mode.

Recommendations:

• Try to avoid Hong Kong servers, as they may affect TikTok region detection.
• For the same TikTok account, try to keep using the same server to avoid cross-region recommendations.
• If one server does not work well, switch to another server in the same region instead of changing countries too often.

If it still does not work:

• Switch between Wi-Fi and mobile data, then try again.
• Change to another non-Hong Kong server.
• Fully close TikTok and reopen it.

For long-term stable TikTok use, keep using the latest 5UF VPN app and try to maintain a stable server and network environment.

To support certain legacy VPN dialing protocols, 5UF VPN previously introduced a Compatibility Password.

The Compatibility Password is mainly used for:

• L2TP

• PPTP

• IKEv2

• “Super VPN” servers in the browser extension (Note: not during the first login, but when selecting a server and being prompted to enter the password again.)

These legacy protocols have technical limitations:

• The password must be stored in plaintext on the server side

• Special characters are not supported

• Encryption standards are outdated

Because of these constraints, a separate Compatibility Password was required.

What is the regular account password?

The latest 5UF VPN APP now uses a modern password encryption mechanism that meets current industry security standards:

• Passwords are securely encrypted and stored

• Full character set supported (including special characters)

• Not directly tied to VPN dialing authentication

• No plaintext storage required

In the new client, VPN authentication is handled through upgraded secure mechanisms and is independent from the old Compatibility Password.

Why are we phasing out the Compatibility Password?

Due to the technical limitations of legacy protocols:

• Passwords must be stored in plaintext (security risk)

• No support for special characters

• Weaker encryption design

For security reasons, we have decided to gradually discontinue support for Compatibility Passwords and legacy protocols.

Can existing users still use the Compatibility Password?

Yes, existing users can continue using it for now.

However:

• If you change your account password

• The new password will become your regular account password

• The old Compatibility Password will not automatically sync

• The two passwords will become different

This is why we strongly recommend migrating to the latest client.

Our Recommendation

We strongly recommend all users:

• Switch to the latest version of the 5UF VPN client

• Stop using legacy apps

• Stop using legacy protocols (L2TP / PPTP / IKEv2, etc.)

Legacy protocol support and Compatibility Password functionality will be discontinued in future updates.

The new client provides:

• Stronger encryption

• Higher security standards

• More stable connections

If you have any questions, please contact our support team via the in-app ticket system.

1. What is the Push Notification Test?

To ensure you receive customer support replies, account alerts, and important service updates, 5UF VPN now includes a Push Notification Test feature.

Tap “Start Test,” and a test notification will be sent to your device. The result will show:

• ✅ Delivered

• ❌ Failed

This helps you verify whether push notifications are working properly.

2. Why do VPN apps face more push issues?

VPN apps are more likely to encounter push delivery issues due to:

• Android devices in China not supporting Google FCM

• Manufacturer ROM restrictions (MIUI, EMUI, ColorOS, etc.)

• Aggressive battery optimization

• Network policy conflicts

Regular testing is recommended.

3. Special Notice for Android Devices in Mainland China (Important)

Android devices sold in Mainland China:

• ❌ Often do not support Google FCM

• ❌ May restrict overseas push channels

• ❌ Frequently disable background connections

You may need to:

1️⃣ Enable Auto Start

Settings → App Management → 5UF VPN → Allow Auto Start

2️⃣ Disable Battery Optimization

Settings → Battery → App Power Management → No Restrictions

3️⃣ Allow Background Activity

Make sure the app is not restricted or “deep sleeping.”

Brand-specific paths:

• Huawei: Battery → App Launch Management

• Xiaomi: App Management → Battery Saver

• OPPO / vivo: Background Freeze Management

4. What if the test shows “Failed”?

Please check:

• Notification permissions are enabled

• Network connection is stable

• Restart the device

Some Android systems temporarily suspend push channels.

5. Delivered but no popup?

Possible reasons:

• You were using the app

• Notification was delivered silently

• Marked as low priority

Check your notification history.

6. Does VPN status affect push delivery?

Generally no.

However, delays may occur when:

• Switching VPN nodes

• Experiencing unstable network

• Device enters deep power-saving mode

7. When should I test?

Recommended after:

• Changing devices

• Updating system

• Updating 5UF VPN

• Suspecting missed notifications

8. Why are push notifications important?

Push notifications ensure you receive:

• 🔔 Customer support replies

• 🔔 Account alerts

• 🔔 Service maintenance notices

• 🔔 Security updates

This is especially important for VPN users.

9. Still not working?

Please contact support in the app and provide:

• Device brand & model

• OS version

• Screenshot of test result

We’ll assist you further.

1. Close 5UF VPN completely

   • Make sure the application is fully exited.

   • Check the system tray and Task Manager to ensure no 5UF VPN processes are running.

2. Navigate to the cache folder

   • Open File Explorer and go to:

     C:\Users\user\AppData\Roaming\com.top.wuf

   • Important: Replace user with your own Windows username, as that folder represents your account.

3. Delete all files inside this folder

   • Select all files and folders inside com.top.wuf and delete them.

   • This clears any cached data that may be causing issues.

4. Restart 5UF VPN with administrator rights

   • Right-click the 5UF VPN icon and choose Run as administrator.

   • This ensures the app can rebuild its cache properly and avoids permission issues.

✅ After this process, 5UF VPN should start fresh, without old cached data causing errors or slowdowns.