The Xiaomi Mi 9T, also known as the Redmi K20 in the Asian market, is still popular due to its bezel-free design and a productive processor. However, over time, even such powerful devices start to work slower, and the main reason for this is often overcrowded system memory. Accumulated data from temporary files, remnants of remote applications and browser cache can take up gigabytes of useful space critical to the stable operation of the system.
The procedure for cleaning the cache on MIUI is not always obvious for beginners, since the Android settings menu has its own specifics. Incorrect cleaning can lead to loss of important data or reset application settings, so it is important to understand the difference between the system cache, user data and the cache of individual programs. In this article, we will discuss in detail all safe methods for freeing memory for the Xiaomi 9T model.
Regular maintenance of the device extends its life and ensures smooth interface. We will look at both standard built-in tools and deeper cleaning methods through the engineering menu and file manager. Recovery system cache does not erase your personal photos and contacts, but requires precise follow-up.
Why you need regular cleaning of cache on Android
The Android operating system is designed to speed up the work of frequently used applications, save temporary files that allow programs to load faster and not waste Internet traffic on re-loading the same items, but the mechanism of cache is not perfect: over time, these files can become corrupted or redundant, which leads to conflicts in the work of the software.
When the cache volume becomes too large, the system begins to spend more resources on indexing it and finding the necessary data, this manifests itself in the form of interface twitches, long-term application opening and sudden program closures, especially for the Xiaomi 9T, if its internal memory is more than 90% full.
There is a common misconception that constantly cleaning the cache harms the battery or system. In fact, deleting temporary files is safe if you don't touch the user data folders. App cache is not your personal correspondence or saves in games, but only temporary pictures and scripts.
If you notice that your phone is heating up even in a simple or battery is running out faster than usual, the first thing to do is check the amount of memory you have occupied. Often, it is the overgrown cache of messengers like Telegram or WhatsApp that is the culprit.
Cleaning the cache through the standard Security app
The MIUI shell on the Xiaomi 9T already has a powerful maintenance tool built in, called Security, and has a green shield icon that allows you to quickly scan your device for junk files without having to install third-party software.
To get started, open the app and click on the large Cleanup button, and the system will analyze the files and suggest removing what it considers safe garbage, usually including installer remnants, empty folders, and temporary ad files.
☑️ Quick cleaning algorithm
After the standard cleaning, you should go to the Deep Clean section, where you can find large files that you forgot to delete, such as old videos from messengers or unnecessary documents, and be careful when selecting files in this section, so that important information is not accidentally deleted.
⚠️ Attention: Deep Clean can show files that the system thinks are big but that you need.Always check the content before you delete, especially in Download and Download folders. DCIM.
Using a built-in cleaner is the safest way for inexperienced users to delete the system files needed to run Android. Regular use of this tool (every 1-2 weeks) will help keep the phone in good shape.
Manually cleaning the cache of specific applications
Sometimes the problem isn't the total amount of garbage, but one particular app that's swelled up to a giant size. In Xiaomi 9T, you can spot-clean the cache of any program through your system settings, which is especially useful for social networks and browsers.
To do this, go to Settings → Apps → All Apps. Find a program you want, like YouTube or Instagram, and inside the app menu, you’ll see the “Clean” button and the “Clear Cache” option.
It is important not to confuse the Clear Cache button with the Clear Everything button (or Reset) and the second option will completely delete the application and all your data in it, including logins and passwords, if they are not stored in the cloud, while the cache contains only temporary data.
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If an application is not working properly (flying or freezing), try to clear the cache first, rather than reinstall the program.
For some system applications, the cache clean button may be inactive, which is normal MIUI protection against accidental damage to important system components, and in such cases, it is better to use a general cleanup through Recovery.
Using the Recovery Menu to Clean Up Completely
The most effective way to remove system debris that is not visible by conventional methods is to use Recovery mode. In Xiaomi 9T, this menu allows you to clear the Wipe Cache Partition. This operation is safe for personal data, but requires the phone to be turned off.
To enter recovery mode, turn off the smartphone completely. Then press the volume button and the power button at the same time. Hold them until the Mi logo appears, after which the phone will go to the menu with a black background and yellow text.
Navigation in this menu is done with volume buttons (up and down), and the choice is confirmed by the power button. You need to find the Wipe Data item, then choose Wipe Cache (not to be confused with Wipe All Data!).