How to turn off MIUI optimization on Xiaomi Redmi 9C

Owners of budget smartphones such as Xiaomi Redmi 9C often face aggressive memory management system, known as MIUI optimization. This mechanism is designed to save battery power and speed up the device, but in practice it often leads to incorrect operation of messengers, lack of notifications and forced closure of background applications. Standard power saving settings do not always give the desired result, requiring deeper intervention in system processes.

Disabling this feature is one of the most effective ways to combat the process killer, but this item is hidden in the default developer menu. Accessing it on Redmi 9C running MIUI 12 or 13 shell often requires additional actions, including logging into your Mi Account and, in some cases, using your computer. In this article, we will detail all the steps necessary to activate this important option.

Before we make any changes, it is important to understand that disabling optimization changes the logic of allocating CPU resources. The system stops forcibly closing applications that it considers unused, which can lead to increased energy consumption. However, for users who are critically important to the stability of notifications from Telegram, WhatsApp or banking applications, this compromise is a fully justified step towards personalization of the device.

Preparation of the smartphone Redmi 9C to change system settings

The first and mandatory step is to activate the developer mode, which is hidden from the average user to avoid accidental changes to critical parameters. On Redmi 9C, this process is standard for the Xiaomi ecosystem, but requires care when performing quick clicks. You need to go to the Settings menu, select About phone and find the version of MIUI.

Click the build number seven times in a row. After the fifth tap, the system can request a pattern lock or screen unlock password to confirm your actions. This is a security measure that prevents children or unauthorized persons from accessing the engineering menu. Once you successfully enter the code, you will see a pop-up message that you have become a developer.

Now the path to hidden features is open. Go back to the main settings menu, scroll down to the Additional section and select Developer. That's where all the tools for debugging and fine-tuning the Android operating system are concentrated. However, just by logging into this menu, you won't see the right switch yet.

⚠️ Note: When you are in the developer menu, do not change the values of parameters, the purpose of which you do not know. Incorrect setting of the interface scale or the limit of background processes can lead to unstable operation of the Redmi system. 9C.

It is important to note that some firmware versions may require insertion to activate additional items. SIM-If your smartphone is running without a SIM card, some system features may remain locked or hidden, and make sure that the device is connected to the Internet, as the Mi Account is verified in real time.

Activation of the hidden switch via Mi Account

The most common method, which works on most global firmware versions, requires you to link the device to a Xiaomi account. In the Developer Menu, find Mi or Mi Unlock status Login. If you are not already logged in, the system will require you to enter a username and password.

After successful login to the account and confirmation SMS (If necessary, go back to the previous menu. Now find the Enable USB-You can debug it and activate it. When you first turn it on, it will give you a security alert, confirm the action. Then, in the same menu, a new item should appear. MIUI.

If you log in to the account and include USB-If you don’t have the right torque, try the following algorithm:

• 📱 Make sure that the option is included in the developer menu USB-debugging.
• 🔄 Reboot the Redmi smartphone 9C completely without using a quick reboot.
• 🔐 Check that your Mi Account settings include two-factor protection (this sometimes affects your system’s trust).
• 📶 Make sure you have a stable connection to your Wi-Fi network during the procedure.

It's worth mentioning that in some regions (e.g. Russia or Europe), the item may be called slightly differently, but the essence remains the same. Look for phrases containing the words "Optimization" or "Optimization." If after all the manipulations, the item never appeared, then your version of the firmware requires a more radical approach through the computer.

Method of disconnection via computer and ADB (for advanced)

If the standard method doesn’t work, which is often the case with newer versions. MIUI 12.5 and above, you'll need to use the Android Debug Bridge toolkit, which allows you to send a special command directly to the system, force activating a hidden switch. USB-cable.

You need to get the workspace ready first. Download the Platform Tools from the official Android developer site. Unpack the archive into the root folder of the disk, for example, in C:\platform-tools, so that the path does not contain Cyrillic or spaces. This will make it easier to enter commands in the terminal.

On a Redmi smartphone 9C In the developer menu, be sure to include USB-When you connect the cable to the computer, you'll see a request on the phone screen for debugging permission from that computer, and check "Always allow from this computer," and click "OK." Without this step, the computer won't be able to send a command.

adb shell pm grant com.android.settings android.permission.WRITE_SECURE_SETTINGS

Once you type this command in the command line (preliminarily going to the folder with ADB via the cd command), the permission request will appear again on the phone screen.

adb shell setprop persist.sys.miui_optimization 0

The smartphone will automatically go into reboot. Once the system is turned on, the item Disable MIUI optimization in the developer menu should become active and turned on. If after the reboot the switch switch switches off again, repeat the procedure, but at the end use the command with a value of 1 to turn on, and then again 0 to turn off - this will pull the trigger of the system.

Set up exceptions for important applications

Even after the global optimization has been disabled, the MIUI system on the Redmi 9C has additional layers of battery protection. To be sure of stable operation, you need to customize each important application individually, which is especially true for navigators, activity trackers and instant messengers.

Go to Settings → Applications → All apps. Select the app you want (like WhatsApp). Find the Battery or Energy Saving section. Select No Limits mode here. This will prevent the system from limiting the background activity of the program.

Also, in each app's menu, find AutoStart and activate it, which will allow the app to start right after the phone is turned on without waiting for the user to act, and without this step, some services may not work until the first manual opening.

For critical processes, you can lock the application into memory. Open the menu of running applications (bottom-up swipe and retention), find the window of the desired application and pull it down until the lock appears. Now, when you clear the memory with the Crack button or swipe, this application will not be closed.

The effect of optimisation disabling on autonomy

Many users fear that turning off system constraints will cause the Redmi 9C with its 5,000mAh battery to run out in half a day. Indeed, power consumption may rise, but not catastrophically.The system stops strangling processes, allowing them to perform their tasks, which requires processor resources.

However, in practice, the difference is often minimal, especially if you have no more than one. 10-15 The main category is still given by the screen, mobile network and bright interface. If you notice that the phone is warming or quickly setting down, analyze the statistics in the Battery section.

Often the culprit is not the system itself, but a specific application that is caught in a restart cycle or has errors in the code, in which case updating a problematic application through Google Play or removing it helps. The balance between performance and autonomy on Xiaomi is always subject to customization for a particular user.

💡

Use the battery widgets on your desktop to see in real time which app is most charged, which will help you quickly identify “gluttonous” programs after optimizing.

Possible problems and solutions

When you modify your system settings, you may experience unexpected situations, such as when you turn off optimization, some system applications may not be able to open properly, which is rare, but it is possible on custom firmware assemblies.

If you encounter a cyclic bootloop immediately after applying the settings through ADB, try booting into Safe Mode. For Redmi 9C, this is usually done by pressing the Down volume button when the Mi logo appears. In Safe Mode, third-party drivers and modifications do not load, which will undo the changes.

Another common problem is resetting after a system update, and when Xiaomi releases a MIUI update, it often returns all of the developer's settings to factory values, and you have to repeat the login procedure and disable optimization again, which is normal security behavior.

⚠️ Note: If Google Pay or banking apps stop working after optimizing, check your security settings. Some banks may consider developer rights to be a sign of hacking.

Also worth remembering is MIUI Optimization, which is sometimes confused with the usual one, which is responsible for compatibility of applications with the interface, and disabling it can cause application permissions to reset each time you reboot.

Outcomes and operational recommendations

Disabling MIUI optimization on Xiaomi Redmi 9C is a powerful tool that gives the user back control of the device. You are no longer dependent on algorithms to decide when your alarm goes off and when to stay silent. This is especially important for those who use the smartphone as their main working tool.

But don't take it as a panacea: If a phone is slow because of overcrowded storage or physical battery wear, changing the system flags won't make it magically faster. A comprehensive approach that includes memory cleaning and good application management will give you the best result.

It is recommended to check system updates periodically, but before installing a new version of MIUI, back up important data. New firmware versions can change the structure of the developer menu, making some of the methods described here temporarily unworkable until patches or new instructions are released.

💡

The main purpose of optimisation disabling is to balance the stability of notifications and battery consumption, which each user adjusts individually to his or her use case.

In conclusion, owning a modern Android smartphone requires understanding the basics of how it works. Redmi 9C is a great platform for experimentation and learning. Using these methods, you turn a budget device into a docile tool that works according to your rules, not according to the manufacturer's rigid algorithms.