The Redmi Note 9 series has decent core sensors, but the software often fails to unlock their real potential. Device owners often face excessive noise cancellation, unnatural HDR or lack of nighttime mode in third-party apps. The solution lies in a ported version of the camera from Google Pixel, known as the GCam.
This article details the process of searching, installing and initial settings of Google Camera specifically for the Xiaomi Redmi Note model. 9 (codenames merlin/merlinnfc). We will discuss why the standard APK-The file may not work, and how to find a configuration that will make the pictures look like flagship.
Before we get to the action, it is important to understand that ports are created by enthusiasts and may require a personalized approach. For the Redmi Note 9 based on the MediaTek Helio G85 processor, ports of version 8.1 and above with support for the libcamerax library are critical. Without this component, the wide-angle lens and zoom can work incorrectly or be completely disabled.
Why you should replace the regular camera with the Redmi Note 9
The main reason for the move to GCam is image processing algorithms. Xiaomi often uses aggressive texture smoothing ("soap") to hide sensor flaws. Google's algorithms, by contrast, preserve detail and natural graininess, making photos more alive.
In addition, owners of the Redmi Note 9 get access to advanced features that are missing from MIUI out of the box: It's about Astrophotography mode for shooting stars, improved night mode Night Sight and better portrait mode with natural background blur.
List of key advantages of installation:
- 📸 Significantly improved dynamic range (HDR+) light-filming.
- 🌙 A real night mode that pulls light from dark areas without losing color.
- 🎞️ Possibility of shooting video in 4K Higher bitrate and stabilization.
- ⚡ Less shutter latency, allowing you to catch quick moments.
But remember, ports are not without their flaws, because some versions may not have a front-facing camera or high-frequency video, so installation is always about balancing functionality and stability.
Choosing the right APK for MediaTek Helio G85
The MediaTek Helio G85 processor installed in the Redmi Note 9 has its own architecture features that set it apart from Snapdragon chips. Many popular GCam builds simply won't run on this device, emitting a start error or showing a black screen.
The most stable versions are those from developers BigKaka (Arnova8G2), Shamim and Urnyx05, who are particularly focused on supporting MediaTek processors, and are recommended to look for builds marked "MTK" or "Helio" in the file title.
The table below compares popular builds for your model:
| Developer | Android version | Stability | Features |
|---|---|---|---|
| BigKaka (8.1) | Android 10+ | Tall. | Best MTK support, there's autofocus |
| Shamim (7.4) | Android 9+ | Medium | Lightweight but less function |
| BSG (8.1) | Android 10+ | Low. | Frequent departures on the Helio G85 |
| Urnyx05 | Android 10+ | Tall. | Good color balance. |
When downloading, pay attention to the processor architecture. Redmi Note 9 usually requires the version of arm64-v8a. Download files with the architecture of armeabi-v7a is possible, but can lead to a decrease in photo processing performance.
⚠️ Attention: Never download APK-Files from dubious sites or unverified Telegram channels. Files may contain malicious code. Use verified sources such as the developer's official Telegram channel or forum 4PDA/XDA.
Preparation of the system for the installation of the application
Before you start the installation file, you need to allow the system to install applications from unknown sources, which is more complicated in modern versions of MIUI due to enhanced security measures.
First, go to Settings. → Annexes → Settings → Special rights of access → Install unknown applications. Here you need to find a browser or file manager through which you will run. APK-file, and activate the resolution slider.
☑️ Preparation of Redmi Note 9
It is also recommended to clear the data of the regular camera app to avoid setting conflicts. Go to Settings → Apps → All Apps → Camera → Clean → Clear Everything. This will not delete your photos, only the program settings.
An important step is to check the free memory: processing photos in HDR+ mode requires a temporary buffer, and if the memory is more than 90% full, the application can close immediately after opening.
Step-by-step instructions for installation and launch
The installation process on the Xiaomi Redmi Note 9 is standard, but has nuances. APK-Click on the file. MIUI It can show a "Protect" screen, claiming that the file is dangerous, and it's a standard reaction to any application not from the Mi Store.
You need to click on the "Clear" or "Still Install" button (the text may vary depending on the version of MIUI), sometimes you need to wait 5-10 seconds for the countdown timer to confirm the action.
After installation, take your time to open the app. First, create a folder for configurations. In the root directory of internal memory, create a folder called GCam (or GCam8.1 for new versions), and that's where you'll need to put the.xml settings file later.
What if the application crashes immediately after launch?
When you first run the app, you'll ask for a number of permissions, be sure to give you access to the camera, microphone, memory and geolocation, and without memory access, you won't be able to save images, and without geolocation, some geotagging functions won't work.
Setting up XML-configuration for the ideal result
The GCam installation itself is just a basic feature, and to unlock the potential of the Redmi Note 9 sensor, you need to use the same basic functionality. XML-This is a preset file that has the best color, noise reduction and zoom settings for your model.
Find a configuration file marked "Redmi Note 9" or "Merlin." Download it and place it in the previously created GCam folder at the root of the memory.
To download the profile:
- 📂 Twice tap the area around the shutter button (or tap the black area around the button if the interface is changed).
- 📋 In the menu that appears, select "Choose config" (Select config).
- ⚙️ Find your file in the list and click on it.
- ✅ Press "Import" (Import).
Once you import it, the app can restart. Now the settings are optimized, and you'll notice the color changes and you'll notice new items in the settings menu that are specific to your sensor.
💡
Use the viewfinder in Photo mode for quick focus check. On the Redmi Note 9, phase autofocus works well, but in macro mode, it's better to switch to manual focus if available.
Solving Typical Problems and Errors
Even with the right port, you can have difficulties. One of the common problems with the Redmi Note 9 is the black screen instead of the viewfinder. This is often treated by changing the settings in the GCam menu: go to Settings → Advanced → Configuration and try changing the camera API (for example, from Camera2 to Camera2 Legacy or HAL3).
Another common complaint is blurry photos when moving, which is a feature of Google's algorithms that take multiple frames and glue them together, and for dynamic scenes, it's better to use Sport mode or turn off HDR+ in quick settings.
⚠️ Warning: If the camera starts to work worse after installing the GCam (lanes appear, focus is lost), restart the device. In rare cases, camera drivers can stick in a certain mode of operation.
Also, users are faced with the fact that video is recorded without sound. Check the Video section in the GCam settings and make sure that the correct audio codec (usually AAC) and sound source (Mic) are selected.
💡
The main problem with installing Redmi Note 9 is compatibility with MediaTek.Look for ports that support libcamerax and be sure to use it. XML-Configs created specifically for the merlin model.