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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.

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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.

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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

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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.

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5. Delivered but no popup?

Possible reasons:

• You were using the app

• Notification was delivered silently

• Marked as low priority

Check your notification history.

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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

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7. When should I test?

Recommended after:

• Changing devices

• Updating system

• Updating 5UF VPN

• Suspecting missed notifications

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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

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If the Windows version of 5UF APP does not respond, crashes, gets stuck, or fails to open, the cause is often damaged local cache data.

Recommended steps:

1. Fully exit 5UF VPN and make sure no tray icon remains.
2. Open C:\Users\YourWindowsUsername\AppData\Roaming\com.top.wuf.
3. Delete the cached files in the com.top.wuf folder.
4. Restart the computer.
5. Right-click 5UF VPN and choose Run as Administrator.

If it still cannot start, contact support and provide your Windows version, device model, screenshot of the error, and the time when it happened.

If you are still using an older client, we recommend switching to the latest 5UF VPN app for better stability and compatibility.

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TUN Mode (Virtual Network Adapter): Full-System Traffic Forwarding

• TUN mode creates a virtual network adapter on your device, intercepting and forwarding all traffic at the network (IP) layer. This ensures that all apps and services — even those that don’t support proxy settings — are routed through the VPN.

• Advantage → Full system coverage for all traffic.
• Limitation → Because it works at the routing level, connections may be less stable under certain devices or network environments.

System Proxy: Consistent Stability

• By attaching your system’s HTTP proxy directly to the VPN service, System Proxy offers a more stable and consistent connection.
• Advantage → Smooth, reliable, and stable performance.
• Limitation → Because some apps and websites do not support proxy mode, they may still be blocked in certain situations.

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If the Chrome extension asks for username and password again after you select a server, do not enter your normal app login password directly.

In this case, you should usually enter your compatibility password to verify the server again.

Recommended steps:

1. Enter your account username first.
2. If the popup is a server verification window, enter your compatibility password.
3. After verification succeeds, the extension will usually continue the connection.

Why does this happen?

The old Chrome extension workflow relied on older extension network APIs to handle authentication and request interception. In newer Chrome versions, extension permissions and interception behavior have changed, so the old method may no longer complete authentication automatically in some cases. That is why a verification popup may appear and require manual confirmation.

According to Chrome's official documentation:

• In Manifest V3, webRequestBlocking is no longer available to most extensions: Chrome webRequest API
• Chrome's migration guide also explains that blocking request listeners should be replaced with the newer declarative model: Replace blocking web request listeners
• Authentication handling (onAuthRequired) also depends on related extension permissions: Handling authentication

Please note:

• This browser extension method is only a legacy compatibility solution and is not recommended as your main long-term setup.
• For better stability, we recommend using the latest 5UF VPN app.
• If the verification popup keeps appearing, make sure you are entering the compatibility password, not your normal app login password.

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If you're seeing a “VCRUNTIME140_1.dll not found” error when launching 5UF VPN, don’t worry — this is a common issue and can be resolved quickly.

This error occurs when your system is missing a required component from the Microsoft Visual C++ Redistributable package, which is used by many Windows applications.

Follow the guide below to fix it safely and get 5UF VPN running again.

5UF VPN -How to Fix the VCRUNTIME140_1.dll Not Found Error (for 5UF VPN)

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In 5UF VPN, Global mode and Partial mode describe how much of your traffic goes through the VPN.

Global mode:

• Most system traffic goes through the VPN.
• Good for users who want a more consistent VPN route.
• Also more suitable for apps that do not support proxy mode well.

Partial mode:

• Only selected websites, apps, or rule-based traffic goes through the VPN.
• Other traffic continues to use the local network directly.
• Useful when you only want specific traffic to use the VPN.

How should you choose?

• If you are not sure, Global mode is usually the simpler starting point.
• If you only want a small part of traffic to use the VPN, choose Partial mode.

The naming may vary slightly on different platforms, but the core idea is the same.

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If you want VPN to open automatically after you sign in to your computer, use the system's built-in startup settings.

Recommendation: use the latest 5UF VPN app together with the operating system's auto-start feature. This is more stable than older client-based solutions.

Windows:

• Add the 5UF app to your startup items.
• For more reliable startup behavior, run it with administrator permission if needed.

macOS:

• Add the 5UF app to Login Items in System Settings.
• This allows the app to start automatically after you sign in.

If you also want it to connect automatically after launch, make sure the related in-app option is enabled.

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If you are only visiting China for a short time and do not rely heavily on international services, roaming with your international SIM card is possible. Most major providers (AT&T, Vodafone, T-Mobile, etc.) offer roaming in China, and these connections often bypass the Great Firewall (GFW), allowing direct access to global services. However, note:

• Roaming is very expensive — often $10–15/day
• Speed is usually limited and may have daily caps
• Not suitable for long-term or high-volume use

If you plan to stay in China longer, or rely on access to services like Gmail, YouTube, Instagram, Google Docs, WhatsApp, we strongly recommend:

• Buying a local SIM card (e.g. China Unicom, China Telecom)
• Using a secure VPN to bypass the GFW

Popular services blocked in China without VPN include:

• Search: Google, Bing (EN), DuckDuckGo
• Social: Facebook, Instagram, Twitter, Threads, Snapchat, X
• Messaging: WhatsApp, Telegram, Signal, Messenger, Line
• Streaming: YouTube, Twitch, Spotify, Netflix (partially)
• Cloud: Google Drive, Dropbox, OneDrive, iCloud (partly)
• Email: Gmail, ProtonMail, Outlook (unstable)
• News: BBC, CNN, NYT, Wikipedia (EN)

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SNI spoofing replaces the actual domain with a “safe-looking” one (like bing.com) during TLS handshake to bypass domain-based restrictions. Useful when VPN access is blocked.

Does SNI spoofing work in all network environments?  

Not always. Some advanced networks inspect TLS fingerprints or certificate data. SNI spoofing improves success rates but is not guaranteed.

Can SNI spoofing help save mobile data?  

Some mobile carriers offer zero-rated data for specific domains (e.g., music or video apps). SNI spoofing may help you benefit from these packages.

Can I choose a custom spoofed domain?  

YES.

Will SNI spoofing affect the VPN server I’m connecting to?  

No. This only affects the domain name in the handshake phase. Your real traffic still goes to the selected VPN server.

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If nothing happens after you tap Connect, the system VPN permission may not have been created correctly, or the old local configuration may be damaged.

Try the following steps:

1. Completely close the 5UF app.
2. Open system settings and remove any old VPN profile or configuration.
3. Open the 5UF app again, tap Connect, and allow the system to create the VPN.
4. If you previously denied the permission, restart the device and try again.
5. If it still does not work, update to the latest version of the app. Reinstall if necessary.

We recommend using the latest app instead of older clients. The latest version has better permission guidance and compatibility.

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Some users notice that the 5UF app seems to use a large share of battery in the iPhone battery report.

In most cases, this is because once VPN is enabled, iOS counts a large part of network activity under the VPN app. It does not necessarily mean the 5UF app itself is consuming abnormal battery.

A simple way to understand it:

• After VPN is enabled, app traffic goes through the VPN tunnel.
• iOS often attributes part of that network activity to the VPN app in battery statistics.
• So a higher percentage does not automatically mean the app itself is using excessive battery.

Under normal usage, you usually do not need to do anything special.

If the battery drain still feels unusually high, try:

• Updating to the latest 5UF app
• Testing again on another network
• Closing unused background apps
• Restarting the phone and checking again

If the issue remains clearly abnormal, contact support and provide your device model, iOS version, and battery screenshot.

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Super VPN is suitable for temporary browser access. For daily use, we still recommend the latest 5UF VPN app.

1. What is the difference between Super VPN and the latest app?

• The latest 5UF VPN app is better for regular use, with better stability and compatibility.
• Super VPN is more suitable for browser-based access and quick switching. It is not a full-system VPN.

2. Does Super VPN only work inside the browser?

Yes. Super VPN mainly works in the browser environment and does not route all system traffic like the latest app.

3. Why does it ask for my password again after I select a server?

In that case, you usually need to enter your compatibility password, not your normal app login password.

• When signing in to the account: usually use your normal account password.
• When a password prompt appears again after selecting a server: usually use the compatibility password.

4. What is the compatibility password?

The compatibility password is kept for old protocols and legacy compatibility mode. It may be different from your normal app login password. Please follow the information shown in your account panel.

5. Why does the extension keep asking me to sign in again?

• Local extension data may be corrupted.
• You may be entering the wrong password type.
• Your browser may have cleared the extension storage.

Try signing in again first. If the problem continues, clear the extension data and add it again, or switch to the latest 5UF VPN app.

6. What if Super VPN is unstable?

Try changing network or switching to another server. If you need a more stable long-term setup, use the latest 5UF VPN app instead of relying on the old browser-based solution.

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Yes. A VPN does not replace your phone's internet connection. It works as an encrypted tunnel built on top of your existing network connection.

That means:

• If you are using mobile data, the VPN works through your mobile data connection.
• If you are using Wi-Fi, the VPN works through Wi-Fi.
• If your phone has no internet access at all, the VPN cannot connect either.

A VPN encrypts and routes your traffic. It does not replace your carrier connection, and it cannot give you internet access when the device itself is offline.

If you are a new user, we recommend using the latest 5UF VPN app for a simpler and more stable experience.

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This article combines several older billing FAQs so you can quickly understand renewal, upgrades, traffic reset, and what “unlimited” really means.

1. How does billing work?

5UF VPN plans are billed by plan period. After purchase, your current billing cycle starts immediately. If you renew, your service time is extended.

2. Why did renewal not restore my service immediately?

If you only renew, the system usually extends your membership time but does not reset the traffic or quota already used in the current billing cycle.

3. What is the difference between renewal and upgrade?

• Renewal: extends the current plan period and does not reset the current quota.
• Upgrade: takes effect immediately, recalculates the billing cycle, and resets the current traffic or quota.

4. Will I lose the value of my current plan when upgrading?

No. The system converts the remaining value of your current plan according to the upgrade rules.

5. Why can an “unlimited” plan still have restrictions?

“Unlimited” means normal personal use is not quickly blocked by total usage, but the platform still applies a fair usage policy to prevent account sharing, resale, or long-term abnormal bandwidth usage from affecting other users.

6. What if I hit a limit by mistake?

If you are a normal personal user and a short burst of traffic triggers a restriction, contact support for review.

For the most stable long-term use, we still recommend the latest 5UF VPN app and suggest avoiding old clients or old protocols whenever possible.

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If you cannot connect to 5UF VPN for the moment, do not panic. We recommend using the latest 5UF VPN app first. Old clients and old protocols are only kept for compatibility.

Suggested troubleshooting order:

1. Confirm that your account is active and has not reached a limit or temporary restriction.
2. Switch network and try again, for example between Wi-Fi and mobile data.
3. Try another server in case one route is temporarily unstable.
4. Completely close the app and open it again. Restart the device if needed.
5. Make sure your system time and time zone are correct.

If you are using Super VPN or an old protocol:

• Make sure you are entering the correct password type.
• If a password prompt appears again after selecting a server, you usually need the compatibility password.
• Old protocols such as PPTP, L2TP, or SSTP are no longer our recommended solution.

If the Windows app cannot start or does not respond:

Clear the local cache first and then start the app again.

If the issue still remains, contact support and provide:

• Device model and system version
• Whether you are using the latest app, Super VPN, or an old client
• Error message or screenshot
• The time when the issue happened

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