Modern smartphones have become universal tools for interacting with the digital world, and Xiaomi Redmi 4X This is no exception, and although it was released a few years ago, it remains popular because of its reliability and autonomy. QR-codes for payment, Wi-Fi connection or linking.
Many users face difficulties, as in stock MIUI firmware (especially in older versions relevant to the Redmi 4X), the scanning function may be hidden or work differently than in new flagships. Android provides basic features, but the Xiaomi interface often requires a specific approach. In this article, we will discuss all available methods, from built-in system tools to third-party applications.
You will learn how to activate hidden camera settings, where to find a separate scanner app in the system, and what to do if the camera refuses to focus on the matrix, we will also address security issues when scanning unknown codes and optimize the device for faster processing of graphics.
Built-in MIUI camera capabilities on Redmi 4X
The first place a Redmi 4X owner should look is the standard Camera app. In the newer versions of the MIUI shell, the scanning mode is prominently displayed, but in this model it can be integrated into general settings or require a mode switch. Usually, when you start the camera, you just point the lens to the code, and the system will suggest you click on the link.
However, if automatic recognition is not working, you need to check the settings. Go to the camera menu, click on the three bars in the upper right corner and select Settings. Here you should look for Code Scanner or QR Recognition. Activating this feature allows the camera to constantly analyze the image in the viewfinder for two-dimensional barcodes.
⚠️ Note: Some global firmware versions for Redmi 4X Auto-scanning function in the camera can be software disabled by developers to save processor resources.
If the camera settings don’t have a corresponding item, it doesn’t mean that the phone can’t do it. Often Xiaomi hides this feature in a separate system application, which we’ll talk about below, and it’s worth checking if access to the camera for system services is blocked in the security section.
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If the camera focuses for a long time, wipe the lens with a soft cloth. Fat spots from the fingers create a soapy image effect, which makes the algorithms unable to read contrast code.
Use of the system application "Scanner"
There is a separate system application in the MIUI ecosystem called the Scanner, which is more powerful than just the in-camera mode, because it recognizes products, documents and business cards. On Redmi 4X, this application is often pre-installed in the Tools folder on the desktop.
When you run the app, you'll see an interface with a big scan button, and it uses the same camera module, but with a different image processing algorithm, and it's faster in poor lighting, and it's better at reading codes from other devices where glare is common, which is critical for older matrices that may have less contrast.
If you don't find an application on your desktop, try searching. Pull down on your desktop (Search function) and type in the word "Scanner." The system must find the appropriate system component. If the search doesn't work, it may have been removed by the user before and will have to be restored.
☑️ Checking the scanner
Importantly, the system scanner has access to a product database and can show product information, not just a link, which makes it useful not only for payment, but also for authenticating products in stores.
Set up permissions and accesses in security
A common reason for the scanner failure is the limitations imposed by the MIUI security system. An antivirus built into the shell can block an application from accessing the camera or the Internet, considering this suspicious activity. For the Redmi 4X with its limited RAM, this is a standard optimization procedure.
To fix this, go to the Security app (green lightning icon). Select Permissions or Apps. Search the Scanner or Camera list and make sure they have access to Camera, Gallery (to download photo code) and Internet. Without access to the network, virus link verification won't work.
| System component | Permission required | Default status | Recommendation |
|---|---|---|---|
| Camera. | Access to the lens | Permitted. | Change |
| Code scanner | Camera, Internet | Partially. | Allow everything |
| Security | Auto-start | Permitted. | Control |
| gallery | Memory. | Permitted. | Permission. |
It's also worth checking the battery saving settings. If the Scanner app is on austerity, the system can "kill" the scanning process immediately after the screen is turned off or the window is rolled out. Set "No Limits" mode for this component to ensure stable operation.
Third-party scanning applications
If Xiaomi’s regular tools don’t satisfy you or don’t work properly, you can always turn to third-party solutions.The Google Play store offers dozens of apps that are often faster and have a more user-friendly interface. For the Redmi 4X, it’s important to choose lightweight apps so you don’t overload the Snapdragon 435 processor.
One of the best options is Gamma Play's QR & Barcode Scanner or similar high-rated apps that open instantly and have flashlight function, which is extremely useful when scanning codes at night or on poorly lit objects. The Redmi 4X's built-in camera doesn't always correctly manage flash in scan mode.
- 📱 QR Code Reader is a minimalist application without unnecessary advertising that quickly reads codes and saves history.
- 🔦 Scan – an application with a convenient widget on the desktop, allowing you to run the scanner in one click.
- 🛡️ Kaspersky QR Scanner is the choice for those who are concerned about security, as it checks links to viruses before switching.
Installing a third-party scanner also solves the problem of not having a widget on your desktop, so you can put the app icon on the home screen, making the scanning process as fast as possible, especially if you use your phone for work or frequent payments.
⚠️ Note: When installing third-party scanners, carefully read the list of permissions requested. If a simple code scanner requires access to your contacts or microphone, this is an excuse to refuse installation.
Scanning from gallery and browser
Sometimes there is a situation where QR-The code is already stored as an image in the phone's memory, such as a screenshot of a ticket or a voucher, in which case you don't need to start the camera. 4X You can use the built-in image analysis function in the gallery MIUI browser.
Open the image in the standard gallery. MIUI with a long click on the image or through the menu “More” appears item “Recognize” QR-code" or "Google Lens. If you don't have that feature, you can use Google Chrome, which is preinstalled on most devices.
In Chrome, click on the camera icon in the Google Lens. You can select an image from the gallery, and the browser recognizes the encoded link. It is a universal method that works regardless of the firmware version and state of Xiaomi system applications.
What to do if the code is damaged?
Solving Focus and Quality Problems
The Redmi 4X has a 13MP camera, but over time the autofocus mechanism can wear out or get dirty. If the camera is buzzing but can't focus on the code, the problem can be physical. However, often it's a software failure of the camera's service.
Try clearing the Camera app cache. Go to Settings → Apps → All Apps → Camera → Memory → Clean. This will reset the zoom and focus settings to factory values, which often helps to bring back clarity. Don't worry, your photos won't be deleted.
If the software methods don't work, try using a third-party manual focus control app (Pro mode), which allows you to manually focus on macro distance, allowing you to read the code even if you have a faulty autofocus, which is a temporary but effective solution.
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Regularly cleaning up the camera cache and checking for system updates is the best way to prevent scanning issues on older Xiaomi devices.