How to Clean Memory Xiaomi Redmi 9: The Complete Guide

Many budget smartphone users face a situation where the device starts to work slowly and notifications of a lack of free space appear with alarming regularity. Xiaomi Redmi 9, despite its popularity and availability, has a limited amount of built-in storage, which is quickly filled with modern applications, media and system files. If you notice that the phone is “slowing down” or stopped accepting new messages in instant messengers, it’s time to do a general cleaning of the digital space.

In this article, we will take a look at all available optimization methods, from simple built-in tools to radical reset measures. You will learn to find hidden files, clear cache without harming personal data, and properly configure synchronization with cloud services. Memory release is not a one-time action, but a regular process that prolongs the life of your gadget.

Before you move on to deleting files, it's important to understand the structure of storage. Often, it turns out that the lion's share of space is not occupied by your photos at all, but by long-forgotten installation files of applications or the cache of streaming services. A competent approach will allow you to free up a few gigabytes in just 10-15 minutes without removing anything important.

Analysis of vault occupancy

The first step in the fight for space should be diagnostics, you need to determine exactly which files occupy the most space on your Redmi 9. Android and the MIUI shell provide convenient tools for visualizing data that you should not ignore. Without understanding the structure (employment), you risk deleting system files or, conversely, leaving in place heavy “garbage”.

The built-in analyzer allows you to see the distribution of memory into categories: applications, images, videos, documents, etc. Often users are surprised to find that the Downloads folder has grown to several gigabytes due to automatically stored files from Telegram or WhatsApp. System analysis is the basis for further action.

⚠️ Note: When analyzing storage, look for the “Other” section, which may hide remnants of deleted applications or temporary update files that can only be safely deleted through specialized utilities.

To obtain detailed statistics, follow the following steps:

• 📱 Open “Settings” and find the “About Phone” section».
• 💾 Click on the "Storage" item to start the analysis.
• 📊 Study the color diagram of the distribution (employment) of memory.
• 🔍 Click on any category to see the list of files inside.

Once you've scanned the first scan, you'll get a clear idea of what you're going to be fighting, if you're looking at the bulk of the photos, you'll need to move to the cloud, if you're having a problem with the apps, you'll need to delete them or clean up the data. Redmi 9 allows you to flexibly manage each type of content.

Use of the built-in "Security" application

The MIUI shell on the Xiaomi Redmi 9 preinstalled a powerful system tool called Security, which is not just an antivirus, but also an effective cleaning manager who knows where to look for temporary files and advertising debris, using a regular tool is preferable to installing third-party programs that can consume resources themselves.

Clean up scans your device for cache, residual files and empty folders. The app's algorithms are constantly updated to fit the structure of new Android versions. Running deep clean is safe for your personal contacts and documents.

The optimization process through a standard application is as follows:

• 🧹 Launch the Security app (green icon with shield).
• 🚀 Click on the large “Cleanup” button in the center of the screen.
• ⏳ Wait for the scan to be completed and click “Clear».
• 🗑️ For a deeper cleaning, scroll down and select “Lastage Cleanup».

Special attention should be paid to Deep Clean, which allows you to delete large files, duplicate photos and rarely used applications. Regular use of this tool helps to keep the system in good shape. However, you should not rely only on automatic mode, manual control sometimes gives the best result.

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Set up automatic cleaning in the Security app so that the phone itself makes room when the memory is more than 90% full.

Cleaning the cache and application data

The most voracious consumers of memory in modern smartphones are social networks and instant messengers. Telegram, WhatsApp, Instagram and TikTok store huge amounts of temporary data for fast downloading content. Over time, this cache can grow to tens of gigabytes, taking up almost all the available memory on Redmi 9.

It is important to distinguish between clearing cache and clearing data. The first action deletes temporary files without affecting your correspondence and settings. The second action completely resets the application to the “just from the store” state, removing logins, passwords and correspondence history if it is not saved on the server. Be extremely careful when choosing an option.

⚠️ Attention: Before clearing the data of messengers, be sure to back up the correspondence in the settings of the application itself, otherwise you will lose the entire message history irrevocably.

To manage the application memory, follow the following steps:

• ⚙️ Go to Settings. → Annexes → All applications.
• 📱 Find a “heavy” app (like YouTube or YouTube) in the list. VK).
• 🗑️ Click on “Storage” and select “Clear Cache».
• 🔄 If the application is not working correctly, you can select “Clear all data».

Special attention should be paid to the gallery and browsers. Photo cache and saved web pages can take up substantial space. In Chrome or MIUI Browser, history and cache can be cleared through privacy settings. Regularly cleaning the social media cache is the fastest way to free up space.

Remember to check the "Storage Management" section inside the apps themselves. For example, Telegram has a built-in automatic cache cleanup feature that can be configured to delete files older than 3 days, which will save you from having to do it manually.

Working with media files and folder Downloads

The Download folder is the black hole in any smartphone's memory, and it's got documents, installations. APK-Files, browser pictures and saved stickers. On Xiaomi Redmi 9, this folder is often ignored by the user for months until the empty space runs out.

Media files also require revision. High-resolution videos can take up gigabytes of space. Unless you plan on storing them forever on your device, you'd better migrate them to your computer or to cloud storage. The MIUI file manager allows you to quickly sort files by size and date.

Algorithm for cleaning media content:

• 📂 Open the “Conductor” or “Files” application».
• 📥 Go to the Download folder (Download).
• 🗑️ Remove old application installers (.apk files) and documents.
• 🖼️ Check the messenger folders (WhatsApp/Media) for the presence of extra videos.

It's also worth checking the DCIM →.thumbnails folder, which stores thumbnails of your photos. Sometimes this hidden folder can be as big as a few gigabytes. It can be safely cleaned, but the system will recreate it the next time you open the gallery.

If you’re actively shooting videos, set up your camera to record in a more economical format or regularly transfer materials to an external medium.Redmi 9’s internal memory isn’t designed to store archives for years.

Transferring data to the cloud and external media

The modern approach to using a smartphone implies that the device is not the only place to store information. Cloud services like Google Photos, Yandex.Disk or MI Cloud allow you to free up gigabytes on your phone, saving access to files at any time. For owners of Xiaomi, Mi Cloud, integrated into the system, is especially relevant.

Using a microSD card is another efficient way to expand storage. Redmi 9 supports large-volume card installation, and you can transfer music, movies, documents, and even some applications to an external medium (if the system allows it).

⚠️ Note: When transferring photos to the cloud with the “Free Place” function, make sure that the sync is complete, otherwise you risk removing the originals from your phone without waiting for them to be uploaded to the server.

Set up automatic download in Google Photos:

• ☁️ Open the Google Photos app.
• ⚙️ Click on the profile avatar and select “Photo Settings».
• 🔄 Activate the “Sync and Autoboot” switch».
• ✅ After the download is complete, use the function “Free space».

When using a memory card, it is recommended to format it as Portable Storage if you plan to move the card to other devices. If the card is only used in this phone, you can choose formatting as Internal Storage, which will allow you to install applications on it. Expanding the memory with the card is the cheapest solution to the problem.

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Automatic sync with the cloud is the best way to never run into a shortage of space for new images.

Radical measures: Resetting to factory settings

If none of the above methods have worked, or the system is unstable even after cleaning, the final argument is a complete reset, which returns the Xiaomi Redmi 9 to the “out of the box” state, removing absolutely all user data, settings and applications.

This is an extreme measure to take when other methods are exhausted. Before starting a procedure, it is critical to create a full backup of all important data, since it will be impossible to restore it after a reset without a backup. The phone will become a blank slate, which often creatively affects its speed.

Procedure for complete discharge:

• 💾 Make a backup of contacts and photos (required!).
• ⚙️ Go to Settings. → The phone. → Resetting settings.
• 🚫 Select “Erase all data».
• 🔐 Enter the screen unlock password and confirm the operation.

The process can take anywhere from 5 to 15 minutes, during which time the phone will reboot. Once turned on, you will see a welcome language selection window, as when you first turn on a new device.

Alternative login to Recovery mode (if the phone is not turned on):


1. Turn off the device.




2. Press the Volume Up + Power button.




3. From the Recovery menu, select Wipe Data → Wipe All Data.

After reset, don't rush to install hundreds of applications at once. Set only the minimum you need and keep your memory busy. This will help keep the system clean for a long time. Redmi 9 works much faster after reset.

Frequently Asked Questions (FAQ)