Xiaomi Redmi Note 7, released in 2019, is still a popular device due to its excellent price-performance ratio. However, over time, any Android gadget starts to run slower and the internal memory fills up with unnecessary data, a natural process of accumulating cache, residual files and fragments of remote applications.
Owners often face a problem when the system notifies a space shortage or the interface starts to slow down. Cleaning up a device is not just about removing a photo, but about a set of steps to optimize the file system.
In this article, we will look at all the steps from securely deleting temporary files to completely flashing, and you will learn which folders you can touch and which ones you should not touch, so as not to disrupt the MIUI.
Memory Filling Analysis and the Search for Heavyweights
Before we start taking any drastic measures, we need to understand what exactly takes up space. There's an in-built analyzer in the MIUI shell, but it's better to use third-party tools or file managers for deep cleaning. It often turns out that half of the memory is occupied by forgotten videos in messengers or streaming services cache.
Go to the storage settings to see a detailed data distribution diagram, the system will show the volume occupied by applications, images, audio and system files, memory analysis helps to identify hidden space eaters that are not visible when you normally view the gallery.
And look at the Android/data folder, and that's where messengers like Telegram and WhatsApp store all the media they receive, and you can't indiscriminately delete the contents of that directory because you can lose important documents.
⚠️ Note: Before deleting files from system folders, be sure to check their contents. Accidental deletion of files with the.obb extension can lead to the inoperability of games.
For a more detailed study of the structure of the disk, you can connect your smartphone to your computer in file transfer mode, and on a PC, it is easier to sort files by size and date of creation, quickly finding old archives.
Cleaning of system debris with built-in tools
The safest way to start maintenance is to use the regular Security app, which is preinstalled on all Xiaomi devices and has access to system areas closed to ordinary file managers. Run the scan by pressing the appropriate button on the app's home screen.
After analysis, the system will prompt you to delete temporary files, uninstall residues and advertising debris.Cache cleaning through this tool is completely secure and will not affect your personal data, contacts or messages. This is a regular procedure that should be done once a week.
Then go to Deep Clean, where the algorithm will suggest removing large files, rarely used apps and duplicates, and carefully review the list before confirming to avoid accidentally removing the desired ones.
☑️ Weekly cleaning of Redmi Note 7
Special attention should be paid to cleaning the data of specific applications. Go to Settings → Apps → All applications, select a heavy application (for example, a browser or social network) and click “Clean”. It is important to choose “Clear Cache” rather than “Clean Everything” if you want to save logins and settings.
Manual deletion of files through Explorer
Built-in Explorer allows you to access files that the automatic cleaner can't see. Turn on the hidden files in the Explorer settings to see all the directories. Of particular interest are the folders with the names of social networks and messengers at the root of internal memory.
Find the DCIM folder and check the.thumbnails subfolder, which stores thumbnails of your photos and videos. Over time, this file can grow to several gigabytes. It can be safely deleted, the system will create a new one when you need it.
It's also worth checking the Download folder, and users often forget about downloaded app installers (.apk) or documents that are no longer needed, and deleting them will free up valuable space without risking the system.
⚠️ Note: Never delete files with extension.android_secure And don't touch the contents of the folder. MIUI manually, if you're not sure what you're doing, it can cause a malfunction in the interface.
For advanced users, it's helpful to clear the Temp folder at the root of the system, which stores temporary files of various processes, but remember that some applications can create them again immediately after a reboot.
Hidden system folders
Using Developer Mode to Optimize
Android has a powerful tool for engineers, the developer menu, which you can activate seven times by quickly clicking on the build number in the About Phone section, and when the notification appears in the settings menu, a new item will appear for developers.
In this section, you can find settings that affect the speed of the interface, find the options "Window animation", "Jump animation" and "Duration of animation", changing the value from 1x to 0.5x will visually speed up the response of the system.
It also has a Do Not Leave Activity feature, which, if enabled, will completely destroy background processes once you fold the application, freeing up RAM, but can increase battery consumption when switching between programs frequently.
Another useful option is to limit background processes, you can set a limit on the number of applications running in the background, and for the Redmi Note 7 with its storage capacity, this can be a salvation if you don't have enough resources.
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After changing the animation settings, restart your smartphone so that the changes are applied to all system processes correctly.
Reset to factory settings (Hard Reset)
If the software cleanup didn’t help and the device continues to slow down, the last measure is a complete reset. Hard Reset will return the smartphone to the “out of the box” state by removing all user data, accounts and applications.
Before you start, make sure to back up your important data, you can use Google's cloud service or the built-in MIUI backup to your external drive, and without the backup, you'll lose contacts, text messages and photos forever.
There are two ways to reset. One is through the settings menu: Settings → About Phone → Settings → Erase all data. The second way is to press the volume button up and the power button before the Mi logo appears, then select Wipe Data from the Recovery menu.
| Parameter | Description | Risk of data loss |
|---|---|---|
| Clearing the cache | Deletion of temporary files | No. |
| Resetting settings | Return to factory parameters | Tall (removes everything) |
| Formatting | Complete memory markup | critical |
The reset process can take from 5 to 15 minutes, during which time the progress bar will be displayed on the screen. It is strictly forbidden to interrupt the process or remove the battery (if it is not removable), as this will damage the system partition and "brick" the device.
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A complete reset is a radical, but often the only solution for older smartphones that gives a second life to the device.
Prevention and proper use of storage
To avoid going back to cleaning too often, you should develop habits of using your smartphone correctly. Check downloads regularly and delete unnecessary ones. Use cloud storage for photos and videos, leaving only current files on your device.
Avoid installing apps from unknown sources. Often, these programs contain advertising modules that generate a huge amount of junk cache and slow down the Snapdragon 660 processor.
It is also recommended that you do not fill your internal memory by more than 85-90%. Android file system requires free space for the normal operation of the write and read mechanisms.
⚠️ Note: Do not use third-party accelerator apps, which are themselves a source of advertising and often work less efficiently than Xiaomi’s built-in tools.
Compliance with these simple rules will keep your Redmi Note 7 fast and responsive for a long time. Regular maintenance is more important than occasional general cleaning.