Smartphone owners of Chinese corporation Xiaomi often encounter the acronym MIUI, which is the hallmark of their devices, including the popular Redmi line. It is not just a beautiful shell, but a deeply modified operating system based on the open source Android. Understanding what MIUI is is critical for any user who wants to make the most of their gadget.
Many beginners mistakenly believe that they are just buying an Android phone, but in practice they get a unique software product with its own rules of the game. The interface, notification management, memory management and even the ways of installing applications are implemented here differently from Google’s “pure” Android, which is why the nature of this shell becomes the first question worth exploring after unpacking the box.
In this article, we will discuss in detail the system architecture, its key features, advantages over the stock version and possible difficulties that you will encounter. You will learn why Xiaomi Redmi works this way and not otherwise, and how to adapt the device to your personal needs using built-in tools.
Architecture and origin of the shell
MIUI (pronounced "Mi Yew Ai") is developed by Xiaomi Inc. and is a proprietary shell, and its foundation is the Android operating system, but the code is so much changed that it looks little like standard Google Android, and has been under development since 2010, and during that time the system has gone from a simple launcher to a complex ecosystem.
MIUI’s core philosophy is to eliminate the application menu in the classic sense: all program icons are located on desktops, which is similar to Apple’s iOS interface. This decision is made to simplify one-finger navigation and visual clarity. For Redmi Note and other budget models, this optimization allows the system to work smoothly on less powerful hardware.
⚠️ Note: File structure in MIUI It's different from stock Android. Direct copying of system files from stock devices to MIUI This can lead to a cyclical reboot (bootloop).
System processes are controlled by its own dispatcher, which aggressively unloads background tasks to save battery power, which is both a plus and a minus: on the one hand, the phone lives longer, on the other hand, notifications from messengers can come with a delay if you do not configure autostart correctly.
Key differences from stock Android
The main visual marker is the control center. In MIUI, it's divided into two parts: the notification curtain on top and the quick settings panel (flashlight, Wi-Fi, Bluetooth) that is called by swipe from the bottom up. In pure Android, these elements are combined. This ergonomics is familiar to millions of users, but can confuse those who have switched from other brands.
The second important difference is that there are built-in system applications that cannot be removed in the normal way without root rights, such as Security, Explorer, Themes and Mi Credit, which have deep kernel access rights, allowing you to clear cache, speed up games and manage permissions at a level that is not available to third-party programs.
- 📱 Topics: A global platform for changing icons, fonts, sounds and system design entirely, built right into the settings.
- 🔋 Battery Optimization: Built-in algorithm that automatically “sleeps” unused applications to conserve energy.
- 🛡️ Antivirus: Built-in Avast engine or AVL (depending on the region, which checks the APK-file.
It is also worth noting the mechanism of work with permits. MIUI It has its own, more stringent permissions manager, which can conflict with Google Play policies. For example, the app can request access to contacts, but the system can be used to access the user's contacts. MIUI blocks this access unless the user explicitly allows it in the system settings of the Application → Permits.
Interface and navigation in Redmi
Navigation in MIUI has undergone many changes. Modern versions of Xiaomi Redmi use gesture control, similar to iOS, by default: swipe from the bottom to return to the desktop, swipe from the side to return to the back, but for those who are accustomed to the classics, the option of using three on-screen buttons is retained.
The "Second Space" menu is particularly noteworthy, and this unique feature allows you to create a second, completely isolated profile inside a smartphone, so you can switch between it and your main profile by fingerprint or password, which is ideal for separating work and personal life, or for handing over your phone to your children without having to give them personal information.
Customization is available even without deep knowledge. Just go to the Themes app to change the font to the system or download a new one. The system supports live wallpaper and complex transition animations that make using the interface more enjoyable.
System applications and their purpose
The centerpiece of the ecosystem is the Security app, which is not just an antivirus, it's a harvester for controlling the phone, and it's where you clean up the memory, control the battery, adjust the constraints of the background, and even calibrate the screen, and removing or disabling this app can disrupt the stability of the entire system.
The Explorer app in MIUI also has advanced functionality, which hides files in a secure folder that can only be accessed by password or biometrics, and the built-in storage analyzer shows which files take up the most space, allowing you to quickly clear garbage.
Google’s service apps are built into MIUI, but often hidden.To properly work Push notifications in global versions of firmware, Google Play services are used, but in Chinese versions they are replaced by Xiaomi’s own services (Mi Push), which sometimes causes problems with the delivery of messages in foreign messengers.
Update and firmware types
Redmi users often wonder how to update the system. MIUI receives two types of updates: stable (Stable) and weekly (Developer/Beta); stable version comes by air (OTA) and is intended for mass users. It is checked for errors.
Weekly firmware contains new features and experimental fixes, but can run unstable. To switch between firmware types (for example, from Global to Chinese or from Stable to Beta), it is often necessary to unlock the bootloader through the official Mi Unlock tool.
☑️ Check before updating
The update process can be manually run through the Settings menu → About Phone → MIUI version. If you click on the MIUI logo several times, an additional menu will open that allows you to select a firmware file from the device’s memory for local installation.
⚠️ Note: Installing firmware designed for another region (e.g., China on the Global Device) without first unlocking the bootloader will lock the device during the activation phase.
Optimization and productivity
MIUI is known for its aggressive RAM work, and it tends to keep only the active application in RAM, unloading the rest, which is good for autonomy, but bad for multitasking, and to fix this, you have to go to the battery settings and set up the "No Limits" mode for important applications (messengers, navigators).
For gamers, there's Game Turbo, which not only turns off notifications during play, but also redistributes CPU resources to prioritize running gameplay, and you can adjust touchscreen sensitivity and add virtual shoulder buttons.
| Parameter | MIUI (Optimized) | Stock Android (Standard) | Influence on the user |
|---|---|---|---|
| Background processes | Tough (restriction) | Free administration | Best battery, but you may lose notifications |
| Appendix menu | Absent (by default) | There is. | You need to get used to finding icons on the tables. |
| Centre for control | Separate curtain from below | Combined with notifications | Two hands are more comfortable to use. |
| Customization | Built-in (Themes) | Through third-party launchers | It’s easier to change design without root rights |
It is important to understand that the “heaviness” of the MIUI interface requires a sufficient amount of RAM. On devices with 2-3 GB of RAM, the system can run slower than pure Android, due to constant redrawing of the interface and the operation of background services.
Security and confidentiality
The issue of data security at MIUI is often discussed in the context of the company’s Chinese origins, but for global firmware versions (Global ROMs), storage servers are located in Europe and Singapore, which is in accordance with GDPR. Local data, such as notes and a voice recorder, is stored by default on the device.
Mi Cloud offers an iCloud analog for contact backup, SMS, call log and photos. Unlike Google Photos, Xiaomi cloud compression may be free for a certain amount, but it is better to use a hybrid backup scheme.
To protect against theft, you use a Mi Account binding, and if the phone is stolen and you try to reflash or reset, the device will ask for a password from the account, without which it will become a "brick," which is powerful protection, but it requires that the user remember their credentials.
Common problems and their solution
One of the most common problems is advertising in system applications, and in global firmware, you can get rid of it by turning off recommendation services in the settings of each application (for example, in Music, Explorer, Downloads), you need to find a switch Get recommendations and turn it off.
The second problem is the quick battery drain after the upgrade. This is normal in the first 2-3 days while the system re-indexes files and optimizes applications. If the problem persists longer, it is recommended to do a full reset (Wipe Data) after you create a backup.
⚠️ Warning: Do not install third-party themes from unreliable sources. They may contain malicious code or conflict with system fonts, causing reboots.
Also, users often complain about GPS, and MIUI has a separate geolocation accuracy setting, so if the navigator is not working well, check if the card's energy saving mode is in "Hard Saving" mode.