FAQ

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How to install 5UF APP in iPhone

5UF VPN for Android (recommended, with changelog)

Windows one-click setup for all clients (recommended, with changelog)

最新版 4.1 客户端，修正了多个BUG，支持更多协议，连接更稳定，速度更流程，有效保护数据免受篡改与窥探。

Changelog:

2014年12月11日 1.07版对外公布，之前我们内部测试多次，多个版本，所以首个对外的版本是1.07

2014年12月18日 1.08版修正了最小化窗体后，会自动弹出窗口的问题。

2015年01月07日 1.09版修正更新域名后不能使用的问题。

2015年02月11日 2.0.0.0版，增加了N多功能

解决了部分杀毒软件报病毒的问题，是因为压缩的问题，现在已经不压缩。

增加了更换DNS的功能

增加了永久路由功能

增加了添加路由和删除路由时显示百分比

测速时重新加载服务器列表

增加了恢复hosts文件的功能，部分用户因为修改了这个文件，造成部分网站不能访问

生成支持文件（方便我们的帮部分用户分析问题）

优化了部分操作逻辑，比如点击退出时提示是否清空路由，是否最小化，是否断开VPN等问题。

2015年02月15日 2.0.0.1

修复程序退出的时候，右下角的状态栏图标没有消失的问题，鼠标要放一下会自动消失，现在这个问题已经修复。

修复程序启动的时候，如果没有网络出错的问题，现在已经提示正常

win8启动的时候不再自动使用修复sstp功能，只在需要的时候在工具菜单那里运行下

2015年04月29日 2.0.0.2

修复了xp系统下，如果本地网卡是使用自定义DNS，使用我们的工具里设置google dns等后还原后会丢失原来的dns配置的问题。

增强了性能，现在不同的服务器，不同的类型都使用独立的拨号链接，互不影响，解决了以前如果前一个vpn断不开，后面一个不能拨号的问题，（以前是必须重启机器才能恢复）。

2015年09月18日 2.0.0.3

修复深圳部分小运营商运行时，初始化的问题。

增加PPTP是否加密的选项。

在设置工具里增加快速打开“网络连接”。

在没有拨号的情况下退出软件提示“退出会断开VPN" 的提示的逻辑问题。

2015年09月23日 2.0.0.4

断开和连上时在线人数自动加减1，解决断线后需要重新运行程序的问题。

2015年12月23日 2.0.0.5

修复多个连接数时，有时候判断超过连接数错误bug。

针对国内DNS环境不稳定的情况，优化了部分地区有时候初始化问题，现在更加稳定。

取消自动创建的拨号链接功能，现在用户的VPN连接里不会出现我们程序里自动配置的VPN连接。

除了L2TP协议外，360不再提示需要修改pbk文件。

2015年12月26日 2.0.0.6

修复L2TP协议时，重新启动时无法拨号的bug。

修复PPTP加密重新启动时无法记忆的问题。

2016年1月6日 2.0.0.7

修复在测速列表双击服务器选择不了的bug。

windows10需要禁用掉IPV6,才能解决DNS污染的问题.

2016年2月24日 2.0.0.8

修复windows10用户l2tp不能使用的问题.

增强部分网络情况下初始化失败的问题,增强了更多网络环境下的可用性.

windows10用户拨号的时候提示修复禁用IPv6.

修复生成技术支持文件的bug,同时把这个按钮放在登陆页面,确保没有登陆时也能生成技术支持文件.

修复部分网络下断开连接不生效的问题,提示已经断开,事实上没有断开,造成多个连接重拨.

修复不停的点击断开按钮,在线数会减少的bug,事实上不会真减少.

2017.4.20 3.0

完全重新架构的新版本，使用C++重新开发，更加高效

新增加:

直接支持openvpn

多语言系统中不再乱码（但还都显示是简体中文）

全新界面

增加和删除国内路由更快了，可以瞬间完成，以前需要很久的百分比，且增加过程中占用cpu比较高。

连接更多稳定可靠，旧版本在某些环境中l2tp,ikev2不能稳定使用，需要重启机器才行。

更多网络环境中可以用，以前的版本中可能会出现“登陆失败”，新版本已经对这种情况做了更多兼容处理。

2017.4.21 3.1 3.2

修复iKev2模式下，默认网关没有设置的bug

更改点击X为隐藏窗体，更熟悉国人的操作习惯，如果要退出，请在右下角托盘那里，右键退出。

3.2 修复下载配置文件不能更新的bug

2025.7.28 日 4.0

全新架构

2025.8.8 日 4.1

修复了界面还有一些链接问题

Link to this question

How can I verify that using 5UF VPN is safe?

A VPN adds an encrypted tunnel between you and the internet, which lowers the chance of casual eavesdropping on plain HTTP in untrusted networks. Below is a practical checklist plus notes on privacy, technology, and how we operate.

1. Install only from official sources

Use official app stores on mobile and the official 5UF website (or links we publish) on desktop; verify the domain before installing.
Avoid “cracked” builds and random APK shares. Many free or unknown VPNs have a poor track record for ads, data resale, or malware.

2. Account work only on real HTTPS sites

For login, billing, or subscription pages, confirm a trusted domain and HTTPS in the address bar.

3. After connecting, test your IP and DNS (recommended)

With the VPN on and other proxies off, open BrowserLeaks — My IP Address to see the exit IP and rough region. The same site offers DNS leak and WebRTC tests. Results depend on split tunneling, extensions, and dual-stack networks—use them as signals, not a single proof.

4. Can ISPs or police “know I use a VPN”?

Technically, providers often see that your device talks to a remote endpoint with encrypted traffic, volume, and timing. They generally cannot read your HTTPS page contents the way they could with old plain HTTP. Sites and modern apps add another layer of end-to-end TLS that the VPN operator normally cannot decrypt either. What authorities may obtain still depends on law and due process—a VPN is not invisibility.

5. Xray-based stack

Our service commonly builds on open projects such as Xray (for example XTLS/Xray-core) with transports like Trojan wrapped in TLS. Open source enables community review; it is not the same as a formal proof against every adversary, but it is far more inspectable than a closed black box. Keep clients updated and download only from trusted sources.

6. What can the operator see?

In typical HTTPS browsing, we cannot decrypt the payload between you and the website. Exact data categories are spelled out in our privacy policy.

7. Singapore company and compliance

We are incorporated in Singapore and operate under its legal framework. The privacy policy explains retention, security practices, and how we may respond to lawful requests. We do not treat selling user privacy as a business model. Read the policy on our site; open a ticket for questions.

8. Bottom line

No VPN replaces good hygiene—official clients first, skepticism toward “free” unknown VPNs, and regular updates. Report suspicious clones through official channels.

Link to this question

What is the difference between relay nodes and direct nodes?

How to quickly select a server and run speed tests in the 5UF VPN app

Using Sing-box VT on Mac with 5UF VPN

What is the app “availability test” on the home screen, and how does it work?

Multiple Connections Issue

What to do if the VPN cannot connect or is too slow

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

If you are on an older iOS release (for example iOS 15 or earlier) or you cannot use the official app on your device, you may hit compatibility or installation limits. Use a third-party VPN client with 5UF and follow this guide: How to use a third-party app with 5UF VPN (tutorial). The reinstall, speed-test, and ticket steps below mainly apply when you can run the official app.

On iOS 16 or later, update the official app to 5.3 or newer from the App Store before the steps below.

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.

Link to this question

TikTok not working? Quick 5UF VPN setup guide

5UF VPN Push Notification Test – FAQ (English Version)

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.

Link to this question

Difference between Virtual Network Card Mode and System Proxy Mode

How to Create an Overseas Apple ID (Hong Kong) from Mainland China

Need access to apps that aren't available in the Mainland China App Store? Here's a simple step-by-step guide to help you create a Hong Kong Apple ID right from your iPhone — no VPN needed.

?️ Step 1: Go to Apple ID Website

Open Safari (or any browser) and go to https://account.apple.com/account#
Click “Create Your Apple ID” in the top-right corner.

? Step 2: Enter Your Details

Fill in your first name, last name, and date of birth.
Enter a new email address (one that hasn’t been used with Apple before).
Choose a strong password.
Set your country or region to Hong Kong.

? Step 3: Add Your Phone Number

Use your Mainland China mobile number — it’s fine!
This number will receive a verification code, so keep it nearby.

✅ Apple allows you to verify an overseas Apple ID using a Chinese phone number.

? Step 4: Set the Billing Address

For the billing address, you can use any valid Hong Kong format.
Feel free to randomly fill in the address fields — just make sure it's realistic:
- Example:
  - Street: 88 Queensway
  - District: Central
  - City: Hong Kong
  - Postal Code: 000000
  - Phone: +852 6123 4567
For payment method, choose None if it’s available.

? Tip: You can also use a Hong Kong hotel or store address for convenience.

✅ Step 5: Verify and Complete

Enter the verification code sent to your phone number.
Apple will also send a confirmation email — open it and click the link to verify.
Once verified, you can sign in with your new Hong Kong Apple ID.

After signing out, return to the “Media & Purchases” section and sign in using the Apple ID you just created.

This will link your new account to the App Store and allow you to download apps from the selected region.

⚠️ A Few Notes:

Avoid switching Apple ID regions too often — it may affect app updates and subscriptions.
Don't use iCloud syncing with multiple Apple IDs on the same device.
If “None” isn’t showing under payment methods, try creating the account through the Apple ID website first, then log in on your iPhone.

Frequently Asked Questions

1. Will logging out of my Apple ID under Media & Purchases affect my device?

No, logging out only affects store-related services. Your personal data and iCloud services remain safe as long as you're still signed in to iCloud.

✅ Not Affected (if still signed into iCloud):

Photos

Contacts

Messages (iMessage)

FaceTime

iCloud Drive

Find My iPhone

❌ Affected:

App Store & iTunes Store access

Apple Music, if subscribed under that Apple ID

Apple TV+, Apple Arcade, and other subscriptions tied to that ID

Note: When updating installed apps, iOS uses the Apple ID that originally downloaded (or acquired) each app, including free titles, which still count as a purchase record. This is separate from which Apple ID is currently signed in under Media & Purchases for new App Store activity, so updates are generally unaffected.

? Switching from a Mainland China to Hong Kong Apple ID (Media & Purchases only) unlocks:

✅ Apple TV+ and full TV app content

✅ Restricted apps (YouTube, Telegram, WhatsApp, etc.)

✅ Apple Arcade, Apple News, full Apple Music catalog

✅ More payment options (PayPal, HK gift cards)

✅ App Store in English & Traditional Chinese

2. If my phone number has already been linked to another Apple account, can I still use the same phone number to create another account?
Answer: Yes, you can still use the same phone number to create or verify another Apple ID. However, the number can only be associated with iMessage and FaceTime for one Apple ID at a time. You may receive a prompt to verify which Apple ID you want the number to be used with for messaging and FaceTime.
When creating a new Apple ID, keep in mind that you must use an email address that has not been previously linked to any Apple ID. Each Apple ID requires a unique email, and the same email cannot be used to create multiple accounts.

3. What to do when you want to download apps that are only available in mainland China?
Answer: You can simply choose to sign out from the Media & Purchases account and log back into it using your mainland China Apple ID. Since both accounts are yours to manage, you can switch between them as needed to access region-specific apps.

Link to this question

How to fix the missing VCRUNTIME140_1.dll error (for 5UF VPN)

Your Device Type	File to Download	Description
?️ 64-bit Windows	vc_redist.x64.exe	For most modern systems; includes x64 and ARM64 binaries
? 32-bit Windows	vc_redist.x86.exe	Needed for older systems or some 32-bit apps