Redmi Note 9 Pro smartphones have earned their classic status with their excellent price-performance balance, but over time, even powerful hardware can start to run slower. The main reason for slowing down the interface, hanging apps and displaying artifacts on the screen is often overcrowded system memory, stuffed with temporary files. Cache cleaning is not just garbage removal, but a necessary preventive procedure that allows the MIUI system to function stably and quickly.
In this article, we will take a look at all the available ways to free up space, from regular tools to deep cleaning through the engineering menu. You will learn to distinguish the system cache from user data so that you do not accidentally delete important photos or correspondence in messengers. Proper maintenance of your Redmi Note 9 Pro will extend its life and return the responsiveness of the touch screen.
What is cache and why does it accumulate in memory
Cache memory is a buffer in which the Android operating system and installed applications save temporary files to speed up access to frequently used data. When you open a social network or browser, the device downloads pictures and scripts, storing them locally, so that the next time you log in, the page opens instantly. This is a necessary mechanism for comfortable use of the smartphone, but without regular cleaning, it grows to gigabytes.
The problem is that many applications don’t automatically delete old temporary files, creating so-called “tails” that eventually take up space that could be used to install new programs or save photos, and corrupted cache files can cause software conflicts, leading to sudden crashes of applications.
Technical reference
You need to understand the difference between cleaning the cache and completely resetting the settings. In the first case, you only remove temporary debris without touching your personal data, accounts and system settings. In the second case, the phone returns to the state "out of the box", which is only required in case of serious software failures or before selling the device.
Basic cleaning through the standard “Safety” application
The easiest and safest way to free up space on the Xiaomi Redmi Note 9 Pro is to use the built-in system application. Xiaomi preinstalles a comprehensive security tool that allows you to quickly scan the device for junk files without the risk of removing something important.
To get started, you need to find an icon on your desktop called "Security" (green shield) and run it. Once you open it, click on a large "Clean" or "Scan" button, and then the system will analyze the memory and suggest that you delete the temporary files found, which is ideal for weekly maintenance and removal of surface debris.
☑️ Checklist of basic cleaning
It is important to note that a standard scanner does not always find the deep-seated remnants of remote applications or browser cache in full. Therefore, after automatic cleaning, it is recommended to manually check the Memory Management section, where the system will show which categories of files occupy the most space.
Deep Cache Cleaning of Individual Applications
The main memory consumers on any Android smartphone are social networks, messengers and browsers. Apps like Telegram, WhatsApp, Instagram and TikTok store a huge number of images and videos that are often duplicated and take up space even after viewing, and cleaning them will require a more targeted approach through system settings.
To clear the cache of a particular application, go to the Settings menu → Apps → All apps. Find the program you want (like YouTube or Chrome), click on it and select Memory. Here you will see two buttons: Clear cache and Clear everything. The first deletes temporary files, the second resets the application to factory settings, removing logins and passwords.
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Use the Clear Cache feature regularly for video hosting apps like YouTube and TikTok, as they accumulate gigabytes of data in a matter of days of active use.
In Telegram, for example, the built-in cache cleanup works more efficiently than the system one. Go to the Telegram settings, select Data and Memory → Memory Use, and click Clear Cache, which is safe for your correspondence, since media files are stored on the server and re-downloaded if necessary.
Using Developer Mode for Advanced Cleaning
For Redmi Note 9 Pro users who want to gain maximum control over the system, there is a hidden developer mode available, and in this section, tools for forced process stops and more detailed memory management are not visible in the regular menu.
To activate this mode, go to Settings → About Phone and quickly click on MIUI Version 7 times. After the notification “You became a developer”, a new section “Advanced Settings” → “For Developers” will appear in the settings menu. Here you can find options to limit background processes, which indirectly helps to combat cache proliferation.
Also in developer mode, you can force system services to stop, which can stick and consume resources. However, be careful: changing the settings in this section without understanding their function can lead to instability--WIDGET:keypoint: Developer mode is a powerful tool, but only use it if you understand what a particular function is responsible for, so as not to disrupt the system.
Cleaning through Recovery Mode (Recovery Mode)
The most radical, but also the most effective method is to clean the cache partition through Recovery Mode, which allows you to remove the system cache that cannot be removed through the Android interface, and often helps solve problems with the “heavy” firmware update.
To enter recovery mode, you need to turn off the Xiaomi Redmi Note 9 Pro smartphone completely. Then press the Volume Up and Power buttons at the same time. Hold them until the Mi logo appears, then release the power button, but continue to keep the volume up until the Recovery menu appears (usually black with orange or blue items).
In the menu, you can navigate with volume buttons (up/down), and the power button selects the item. You need to find Wipe Data, then select Wipe Cache. Don't confuse this with Wipe All Data, which will completely delete all your files!
| Action. | Risk of data loss | Efficiency | Difficulty |
|---|---|---|---|
| Security annex | No. | Low. | Minimum |
| Cleaning in application settings | No (unless you drop it) | Medium | Low. |
| Third-party cliners | Minimum | Medium | Low. |
| Recovery Mode (Wipe Cache) | No (system cache only) | Tall. | Medium |
Once the cleaning process is complete, select Reboot → Reboot to System. The first boot after this procedure may take longer than usual, as the system will recreate the necessary temporary files.
What to do if your phone is stuck in Recovery?
Automation and third-party utilities
If manual cleaning seems too time-consuming, you can use automated solutions. The Redmi Note 9 Pro already has a task scheduler built in, which can be configured to automatically start cleaning. However, many users prefer third-party applications such as Files by Google or SD Maid.
Files by Google is a great way to integrate into the system and find duplicate photos, screenshots and old files that you haven’t opened in a long time. It offers secure deletion scenarios without affecting system files. SD Maid, in turn, is known for its deep scanner “Cadavers”, which finds the remains of deleted applications.
⚠️ Warning: Avoid installing "aggressive" cliners that promise to speed up your phone by 200%, often as a source of advertising and intrusive notifications, consuming resources in the background.
When using third-party software, be sure to check the permissions you request. The clinder doesn't need access to your contacts or microphone to clean up garbage. Restricting access rights is an important part of digital hygiene and data security.
Frequently Asked Questions (FAQ)
Is it safe to delete the Android folder at the root of the memory?
How often do I need to clean the cache on the Redmi Note 9 Pro?
Why does the cache fill up quickly after cleaning?
Does cleaning the cache affect battery life?
⚠️ Warning: If the phone starts to work worse after cleaning the cache or the apps stop opening, try restarting the device. In rare cases, re-authorization is required in Google or Mi Account accounts.
Compliance with these simple rules will allow your Xiaomi Redmi Note 9 Pro to remain fast and responsive throughout its life. Regular maintenance is the key to the stable operation of any complex electronic system.