CIT app on Xiaomi: what it is, why you need it and how to work with it

If you own a Xiaomi smartphone, you’ve probably noticed a mysterious CIT, a service that isn’t removed by standard methods and doesn’t have a desktop label, and many users are wondering what it is, why it’s needed, and can it be safely deactivated? In this article, we’ll go into detail about the purpose of CIT, its role in MIUI, and give practical recommendations for managing this component.

CIT (Certificate Installation Tool) is Xiaomi’s system application for installing and managing security certificates on a device, which is closely integrated with MIUI firmware and used to authenticate connections to Wi-Fi, VPN, corporate networks and other secure resources. Without it, some smartphone features may not work properly, but in most cases, the average user does not even notice its presence until he encounters compatibility problems or tries to optimize the system.

What is Xiaomi CIT: A Technical Explanation

CIT (Certificate Installation Tool) is a utility application built into MIUI firmware from Android 9 and later, and its primary task is to manage security certificates that are used to:

• 🔒 Authentication on corporate networks (e.g., when connecting to a working Wi-Fi with EAP-SIM or 802.1X protection).
• 🌐 Confirm the authenticity of websites when using VPN or proxy.
• 📱 Installation of user certificates (e.g., to access internal company resources).
• 🔄 Updates to system certificates via OTA (if they have been modified in the new version MIUI).

Unlike the standard Android certificate manager, Xiaomi’s CIT has advanced features to work with proprietary security protocols that are used in the brand ecosystem, such as the Mi Cloud, Mi Account and other proprietary services that require authentication of the device.

It is important to understand that CIT is not a virus or spyware – it is a legitimate component of MIUI that is being tested for compliance with Google’s security policies. However, its closed source and lack of documentation often raise suspicions among users, especially amid rumors of “surveillance” by Xiaomi.

Why Xiaomi needs CIT app: real use cases

In practice, CIT is involved in a few key scenarios that the average user may not even know about.

In addition, CIT can automatically install certificates for:

• 📌 Enterprise applications (e.g. Mi Browser, Mi Video) if they use secure connections.
• 📌 Security Updates from Google Play Services (if distributed through Xiaomi servers)
• 📌 Local services (e.g., when connecting to smart Mi Home devices via a local area network).

If you are not using corporate networks, VPNs or other secure connections, CIT will run in the background without any noticeable impact on performance, but in some cases (such as manually deleting certificates), its interference can lead to failures.

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If you have a “No Trust Certificate” error after the MIUI update, try resetting your network settings to Settings → System → Settings Reset → Resetting your Wi-Fi, mobile network, and Bluetooth settings. This often helps restore the correct CIT operation.

Can I remove or disable CIT on Xiaomi?

Technically, removing the CIT is possible, but it is highly discouraged for no good reason.The application is system-based and uninstallation may result in:

• ❌ Unable to connect to secure Wi-Fi networks (especially in universities, offices, hotels).
• ❌ Mi Account, Mi Cloud and other proprietary services are affected.
• ❌ Update errors MIUI via OTA.
• ❌ Problems with VPN if they use user certificates.

However, if you are sure that you are not using functions that depend on the CIT, You can turn it off (but not delete it!) through Settings. → Annexes → Application management → Three dots (menu) → Show system-based → CIT. For that:

Open Settings → Applications

Click on the three dots in the upper right corner and select Show Systems

Find it in the CIT list (or com.android.cit)

Select Disable (Do not "Delete!")

Confirm the action.-->

If the Disable button is inactive, it means that the CIT is being used by some system service at the moment, in which case you can try:

1. Reboot the device and try again.
2. Disable Mi Account (if not needed) in Settings → Accounts → Mi Account.
3. Remove all user certificates to Settings → Security → Additional → Encryption and credentials → User credentials.

How to check if the CIT is working correctly?

If you suspect that the CIT is not working properly (e.g., certificates are not installed or connection errors occur), you can perform several checks:

1. App status check: Go to Settings → Applications → Application management → CIT and make sure it is not disabled. If status is "Stop," try running it manually.
2. Secure network connection test: Try connecting to Wi-Fi with WPA2-Enterprise (e.g., at a university or office) if the connection fails, the problem may be CIT.
3. Log Checker: Use the Logcat app (developer rights required) and look for errors with the CitManager tag or CertificateInstaller.

If CIT doesn’t work, try the following steps:

• 🔄 Reset network settings: Settings → System system → Resetting settings → Resetting Wi-Fi, Mobile Network and Bluetooth.
• 🔄 Clear the app cache: in settings CIT, click Storage → Clear the cache.
• 🔄 Update MIUI: Sometimes bugs in CIT are fixed in newer firmware versions.

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If critical functions (such as Mi Account login or updates) have stopped working after CIT manipulation, the only way to get everything back is to reset your smartphone to factory settings or reflash it through Fastboot.

CIT and Security: Myths and Reality

One of the most common misconceptions is that CIT is used by Xiaomi to collect user data.

• ✅ CIT does not transfer personal information to Xiaomi servers, but only manages certificates locally on the device.
• ✅ All certificates are stored in secure Android storage and are not available to third-party applications without root rights.
• ✅ Xiaomi cannot remotely install a certificate without your consent (except for security updates through Google Play Services).

However, there are also legitimate claims against CIT:

• ⚠️ Closed source does not allow independent experts to check whether it has vulnerabilities.
• ⚠️ Automatically install certificates without notifying the user (e.g., when connecting to some public Wi-Fi).
• ⚠️ Difficulty to disable for users who do not need its features.

⚠️ Warning: If you use a Xiaomi smartphone to work with sensitive data (for example, in banking applications or corporate systems), it is recommended to regularly check the list of installed certificates in Settings → Security → Encryption and credentials. Delete unknown or suspicious certificates, as they can be used for MitM attacks (traffic interception).

Alternatives to CIT: Can we do without it?

If you’ve decided to get rid of CIT, there are a few alternative ways to manage your certificates on Xiaomi:

The most reliable option for most users is to keep the CIT on, but limit its activity.

1. Open CIT settings in Settings → Applications.
2. Please stop accessing the internet (if this option is available).
3. Limit your work in the background (Battery → Battery Optimization → All applications → CIT → Limit).

If you still want to opt out of CIT altogether, consider installing a Google version of MIUI (like MIUI Global without Chinese services) or custom firmware, but keep in mind that this could lead to a loss of warranty and potential update issues.

Frequent CIT Problems and Solutions

Even if you haven't touched CIT, it can crash, and let's look at the typical mistakes and how to fix them:

• 🚫 “Failed to install certificate” when connecting to Wi-Fi: Try downloading the certificate manually (e.g. from your school’s website) and installing it through Settings → Security → Encryption and credentials → Install from storage.
• 🚫 CIT is constantly consuming battery: This can happen if an application is fixated on checking certificates. Try clearing its cache and data in the application settings.
• 🚫 No Certificate Trust Error in your browser or applications: Remove the problematic certificate in Settings → Security → User credentials and install it again.
• 🚫 CIT does not turn off: This means it is being used by the system. Try disabling Mi Account or restarting the device to Safe Mode (hold the turn off button → Safe Mode).

⚠️ Warning: If you have banking applications (e.g., SberBank Online or Tinkoff) that have been manipulated after you have been certified, it is because they check the integrity of system components, and you can only restore them by resetting the device to factory settings or flashing it.

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If you're not sure what you're doing, you should avoid touching CIT and its associated certificates, and 90 percent of the time, network connectivity problems are solved not by removing CIT, but by setting the certificates correctly.

FAQ: Answers to popular questions about CIT on Xiaomi