Many users of Xiaomi smartphones, in particular the popular model Redmi Note 9, are wondering the possibility of using the payment system Samsung Pay. This is quite logical, because the service is characterized by a high degree of transaction protection thanks to MST technology, although in modern terminals more often used the NFC standard. However, official support for the service is available only on the devices of the South Korean giant, which creates artificial restrictions for owners of other brands.
The Redmi Note 9 is complicated by the fact that contactless payment hardware is present, but software is closed, and it requires a number of technical manipulations to run an application on an unsupported device, and it is important to understand that the process is not standard and requires careful handling of system files and security certificates.
In this article, we will take a look at all the stages of preparation and installation, how to bypass device authentication and make the application work steadily, how to program methods and set up the developer menu, and whether you are ready to experiment and have a stable Internet connection will be your main allies in this process.
Compatibility check and device preparation
Before you start installing, you need to make sure that your Redmi Note 9 does have the necessary NFC module. Not all modifications of this model are equipped with a short-range chip, and trying to install a payment application on a device without hardware makes no sense. You can check the presence of the module in the specification on the box or in the settings menu, where the NFC switch should be.
Next, look at the MIUI version of the operating system. Older Android builds may not support the latest versions of security libraries that are required for Samsung Pay to work. It is advisable to update the firmware to the latest available version through the Settings menu → About Phone → Update MIUI. This minimizes the risk of conflicts when installing modified components.
You also need to make room for internal memory and make sure that the device does not have conflicting payment systems in active mode. Although they may coexist, you should leave only the target application for the initial setup. Make sure that the Galaxy Account is already created or ready to register, as without it, you can not log in to the application.
- 📱 Make sure that your Redmi Note 9 specifications are supported NFC.
- 🔄 Update the operating system MIUI until the last available version.
- 🆔 Create or remember the Samsung Account login details in advance.
- 💾 Free up 500MB of free memory for cache and data installation.
The necessary tools and APK-file
Since Samsung Pay is not available in the Google Play Store for Xiaomi devices, you will need to find the installation file manually.Using third-party resources carries certain risks, so it is extremely important to download. APK-files only from trusted repositories, such as APKMirror or official forums XDA Developers. Files must be signed with the original developer certificate.
In addition to the application itself, you’ll need a plugin or a modified version of the services that removes the device model check, often files with names that contain patch or mod. Without such a patch, the application will simply display a compatibility error when it starts or require the software to update, after which the cycle will repeat.
Managing access rights and implementing system changes may require Root superuser rights, although in some cases they do without them, using Shizuku registry swapping or similar utilities. If you are not ready to get full permissions on the device, look for instructions marked "No Root", but be prepared for the fact that the functionality may be limited.
⚠️ Attention: Download APK-Files from unverified sources in Telegram channels or on dubious sites can lead to malware infection of the device. Always check the hash amount of the file, if possible.
Where to look for secure versions of APK?
Step-by-step installation instructions
The installation process begins by disabling standard Google Play Protect protection, which can block the installation of modified applications. To do this, go to the Play Market store, click on the profile icon and select Play Protection. → Settings. You need to uncheck the "Check applications" box. APK-Samsung Pay file.
Install the application, but don't run it yet. First, you need to install a compatibility patch if it's a separate file. In some builds, the patch is already built in, and it's easy to install the application. Once installed, open the application, but before authorization. If the system requests service updates, agree, but don't give the application full rights right away.
Next comes the critical step of implementing certificates: you need to copy certificate files to the system folder /system/etc/security/cacerts/. This operation requires root rights or the use of a special script through ADB. Without this step, the application will not be able to establish a secure connection with the bank.
☑️ Checklist of installation
Once you have the certificates, restart the device. When you first start up, the app must determine that the restrictions are lifted. Sign in to your Samsung Account. If the login is successful and the main menu is open, then the main stage is passed. You can now link your bank cards.
NFC setup and adding cards
When the application is running, the first thing you need to do is activate the NFC module. On the Redmi Note 9, this is done through the notification curtain or in the Settings menu → Connection and Sharing → NFC. Make sure the switch is active, and Samsung Pay is chosen as the default payment application. From the Contactless Payments menu, select the appropriate item.
Adding a card is done in a standard way: press the add button, scan the card with a camera or enter the data manually. The system will contact the bank for verification. This can be complicated: some banks do not support tokenization for devices that are not on the list of supported Samsung, in which case the card simply will not be added, and it is almost impossible to get around it software.
If the card is added successfully, make sure to make a test payment. Bring the phone to the terminal. If the terminal requests a pin or biometrics and the payment passes, you've done the job. Otherwise, check the error logs in the application or try re-tethering the card.
| The adjustment phase | User action | Expected output |
|---|---|---|
| Activation of the module | Enabling NFC in the settings | NFC icon in the curtain |
| Choice of service | Install Samsung Pay by default | The system does not offer Google Pay |
| Verification | Data entry map and code from SMS | Map is displayed in the list |
| Payment test | Annex to the terminal | Successful transaction |
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When adding a card, use mobile internet instead of Wi-Fi. Bank tokenization gateways often work better with mobile devices. IP-addresses of telecom operators, less blocking requests from non-standard devices.
Possible errors and methods of their solution
One of the most common problems is the “Unsupported Device” error or the endless update cycle, which indicates that the compatibility patch did not work or was installed incorrectly, in which case, try to find a more recent version of the modified APK or check the permissions to access system files if the root-right method was used.
Another common problem is that a bank refuses to add a card, and the bank's technical support may claim that the device is not supported, only waiting for the bank to expand the list, or using alternative methods, such as virtual cards, if the bank provides them, can help.
NFC may also crash after a MIUI firmware update. Android security updates can heal your modifications by returning certificate files to their original state, in which case the certificate implementation process will have to be repeated after each major system update.
⚠️ Note: If after installing the app, the Redmi Note 9 battery started to run out much faster, it is possible that the background process of Samsung Pay is constantly questioning. NFC-Try to limit the background activity of the application in the battery settings.
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Most of the errors are not related to the application itself, but to locks by banks or incorrectly installed system security certificates.
Security and stability of work
There are always risks involved in using modified versions of payment applications, and you trust a third-party patch developer to access your financial instruments, and while most of the communities that create these mods value reputation, the theoretical possibility of data leakage through a modified APK exists.
Samsung Pay on Xiaomi may also be unstable when upgrading Google Play Services components. Since the bundle is not official, any changes to the API by Google may temporarily disrupt the payment system.
To minimize risks, it is recommended not to store large amounts on your device on attached cards, but to use a main card with a limit on online payments, and regularly check the history of transactions in the banking application for suspicious activity.
- 🔒 Use a separate limited-limit card to link to modified applications.
- 👁️ Check your active session list on your Samsung account regularly.
- 🚫 Do not send the codes from SMS to anyone, even if the application requests them again.
- 🔄 Keep an eye out for security patch updates on developer forums.