Why NFC does not work on Xiaomi Mi 9: reasons and solutions

A situation where it stops working NFC-The module on the flagship smartphone, always catches you by surprise: you go to the subway turnstile or the cash terminal, attach your Xiaomi Mi 9, but the device does not react. At best, the screen just does not light up, at worst, an error message appears or the payment does not pass. This creates a noticeable discomfort, as contactless payment has become an integral part of everyday life.

Xiaomi Mi 9 owners don’t face this problem as often as budget line users, but there are cases. Most often it’s not a physical antenna failure, but software conflicts, system service failures or incorrect security settings. Understanding the nature of the failure is the first step to quickly restore functionality without going to the service center.

In this article, we will discuss in detail all possible reasons why NFC It might not work on your device. We'll look at the software settings, the features of working with the computer. SIM-In 90% of cases, the problem is solved by reconfiguring the security element or resetting the network settings without requiring replacement.

Basic diagnostics and checking settings

The first thing to do when you detect a problem is to make sure that the module is actually activated. Sometimes users accidentally turn off the feature in a hurry or after updating the system settings may get lost. On the Xiaomi Mi 9, the switch is in the notification curtain or in the settings menu. Go to Settings → Connection and Sharing → NFC and check the position of the slider.

If the slider is active but there is no payment, check out the Security Item, which is a critical parameter that determines where payment data is stored. HCE Wallet, if it's chosen. SIM-card, contactless payment through standard applications will not work.

Also worth checking is whether flight mode or power saving mode is on, which can block radio modules to save charge. Try rebooting the device is a banal but often effective method of resetting temporary system errors that interfere with proper operation. NFC-chip.

• 📱 Make sure that the settings are selected HCE Wallet as a security element.
• 🔄 Perform a full smartphone reboot to reset the cache of services.
• 🔋 Turn off the power saving mode during the module operation check.

⚠️ If, after the change of security element, the HCE Wallet requires a reboot, be sure to do this. Without a reboot, the new settings will not take effect, and the module will continue to work incorrectly.

Problems with SIM-map-and-operator

One of the specific reasons for the failure of the Xiaomi Mi 9 is the conflict SIM-card-holder NFC Some carriers have their own payment applications that can intercept control of the module. SIM-The system may attempt to use it as a basic security element, ignoring virtual cards.

Check if it's sitting tight. SIM-Bad contact can cause periodic failures in the antenna, because part of the antenna is not very good. NFC-The antenna is often integrated into the tray design or is in close proximity. SIM-map, wipe the contacts and paste back, making sure the tray snapped to the end.

Owners of two-sided devices should know that NFC Xiaomi Mi 9 only works through one slot (usually the first one). SIM-Maybe the system has lost its binding, try moving the card with the support of payment services to another slot or temporarily retrieve the second one. SIM-diagnostics.

It is also important to check for updates to the operator's profiles. Sometimes operators release new network settings that may conflict with Google's security standards. Go to your mobile network settings and click "Update Profiles" or a similar button if it is available in your version of MIUI.

Conflicts between Google apps and services

Often the reason for what doesn’t work. NFC, Third-party applications that have access to the communication module become available, antiviruses, task managers or alternative payment systems can block access to the communication module. NFC-Check the list of recently installed applications and try to remove those that require access to a secure item.

Special attention should be paid to Google Play services, which are responsible for verifying the device and tokenizing cards. If the service cache is overflowing or files are damaged, payment will not be processed. You need to clear the data and cache of the Google Play Services and Google Pay (or Wallet) application. To do this, go to Settings → Apps → All applications, find the right one and select “Clean”.

Another important aspect is the presence of Root rights or unlocked bootloader. Banking applications and payment systems use the SafetyNet protocol (or its new counterpart, the Play Integrity API) to verify the integrity of the system. If the Xiaomi Mi 9 has an unlocked bootloader or installed kernel modifications, NFC can be blocked at the level of the bank's security policy, even if the module is technically correct.

⚠️ Attention: Using magnetic covers or magnetic stripe cards located next to the camera may shield the signal.

Hardware malfunctions and physical damage

If software methods haven't worked, it's worth considering the possibility of a physical breakdown. Xiaomi Mi 9 has a glass back cover, making it vulnerable to impact. NFC-The module, which is a thin antenna, may have peeled off or become microcracked when it falls. The antenna is often attached to a double-sided tape to the back cover or frame.

Signs of hardware failure are: complete lack of response to any NFC-tags (not only payment, but also reading transport cards, key fobs), heating the bottom of the smartphone in the area of the camera when turned on NFC, or spontaneously shutting down the function a few seconds after activation.

It's also worth checking if there's been a recent ingress of moisture, and the water can cause the plume contacts to oxidize, which connects the antenna to the motherboard, and in these cases, the module can be unstable, turn on and off. Visually inspect the tray. SIM-cards for moisture indicators (if any in your revision) or traces of corrosion.

If you suspect a "pillar" antenna, you can try to gently press the area in the upper part of the back cover (near the main camera), where the plume is usually located. If the function starts to work when pressing, then the contact is broken and you need to disassemble the device for gluing the antenna.

Resetting network settings and returning to factory

When none of the above methods work, the radical but effective step is to reset the network settings, which will remove all stored Wi-Fi passwords, paired Bluetooth devices and mobile network settings, but often eliminates deep driver software conflicts.

You can reset via Settings menu → Connect and share → Reset Wi-Fi, mobile networks and Bluetooth. After that, the phone will reboot and you will need to re-enter passwords from the networks. This action does not affect personal files, photos or contacts.

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Before you perform a full reset, be sure to back up your data in the Mi Cloud or on your computer. Resetting to factory settings will remove all information from the internal drive.

If the network reset didn't help, the system's firmware files may have been damaged, and a full reset to factory settings (Wipe Data) helps, before you do so, make sure you have a Mi Account account and password, as after the reset, the system will require authorization to protect against theft.

Engineering menu and deep diagnostics

For advanced users, you can check the status of the module through the engineering menu. On Xiaomi Mi 9, you can sign in via the command ##6484## or ##4636##. In the hardware testing menu (CIT), you can find the NFC item and run the automatic test.

The test will ask you to put a tag or card to the back, and if the phone vibrates or makes a sound when it reads, it is correct, and the problem lies in the software or account settings. If the test fails or the Start button is inactive, there is a high probability of hardware failure of the controller.

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If the NFC engineering test does not start or ends in error, software recovery methods are useless – a replacement of the antenna module or plume at the service center is required.

Sometimes you can force the NFC configuration to reflash on the engineering menu, but it's not recommended to do this without understanding the processes, because you can get a brick instead of a working phone, and only use these tools if you're confident in what you're doing.

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