Owners of Xiaomi Redmi 9 smartphones often face an intrusive MIUI memory optimization system that aggressively unloads background processes to save charge, a problem that is especially acute when using activity trackers such as the Mi Band in conjunction with the Mi Fit app (now Zepp). If you do not perform the correct setup, notifications of calls and messages stop coming to the bracelet, and heart rate and sleep data can be lost.
The user may notice that after a smartphone reboot or just during the day, the connection to the wearable device breaks down on its own, this is because the built-in MIUI Optimization algorithm considers the application unused and forcibly stops it from working. To avoid constant reconnection and data loss, you need to manually configure the power saving and auto-start parameters for a particular software.
In this guide, we will discuss in detail all the steps necessary to “fix” the application in the RAM of your Redmi. 9. We're going to look at not only the standard settings, but also the hidden developer menus that allow you to completely prevent the system from interfering with the work of the selected programs. 24/7.
Preparation of the device and verification of software versions
Before you start deep customizing system constraints, you need to make sure that the underlying software is up to date and installed correctly. On Xiaomi smartphones with MIUI 12 or newer shell, which is preinstalled on Redmi 9, the security mechanisms work most strictly. Make sure you have the latest available version of the Mi Fit app installed from the official Google Play store or GetApps.
Often users try to use modified versions of trackers downloaded from third-party resources, which can cause conflicts with the security system Android. For stable operation, it is recommended to use the original installation file. It is also worth checking whether the phone is not in the mode of "Super-savings", which blocks most background processes.
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If you have previously installed the app from unknown sources, remove it completely, including cleaning the cache, and download the latest version from the official Google Play store.
It’s also important to update the firmware of the smartphone itself to the latest available version. Xiaomi engineers regularly release patches that fix bugs in the Bluetooth stack and background services. Go to settings and check for system updates to rule out known bugs.
- 📱 Make sure that the Android version on Redmi 9 is relevant to your model.
- 📥 Download the Mi Fit (Zepp) app only from trusted sources.
- 🔄 Check for updates for Google Play Services system components.
- 🚫 Turn off the power saving mode before setting up.
Set up auto-start and security permissions
The first and most critical step is to allow automatic start-up. Unlike pure Android, the MIUI shell by default prevents applications from running with the system. You need to manually find the Mi Fit app in the program list and activate the appropriate switch.
To do this, go to your phone's settings, look for Apps, and select Application Management. Go to Mi Fit. Here you are interested in "Other permissions" or "permissions" where you want to put all sliders in the active position. Pay particular attention to the resolution to display on top of other windows and access to the location.
☑️ Verification of basic permits
Then you want to let the app run in the background without restrictions. The system can offer smart savings, but for a health tracker, that's not the right thing to do. Select the "No Limits" or "No Limits" option so that Android doesn't try to guess if you need the app right now.
⚠️ Note: If you do not turn on auto-start, after each smartphone reboot you will have to manually open the application, otherwise notifications on the bracelet will not come.
Battery management and memory retention
The next step is to fine-tune your energy consumption. In the Battery and Performance menu (or simply Battery), find a list of apps and select Mi Fit. Here you need to change your savings strategy. Standard mode may limit background activity, so select the No Limits option.
Once you have set up the power saving, it is recommended to fix the application in RAM via the multitasking menu. Open the list of running applications, find the Mi Fit window and click on the lock icon (or hold your finger for a preview until the lock icon appears), this will give the system a signal that this process is a priority and should not be closed when cleaning the memory.
Why isn't the castle coming?
Memory retention is especially important for devices with a memory capacity of 3 or 4 GB, which is often equipped with Redmi 9. When resources are not enough, the system primarily closes processes without the status of “important”, and the presence of a lock helps to maintain a connection with the wearable device.
| Setup parameter | Recommended value | Impact on work |
|---|---|---|
| Auto-start | Included. | Launching with the system |
| Background activity | No restrictions. | Continuous synchronization |
| Locking (Lock) | Actively (Castle) | Protection against unloading |
| Notifications | Permitted. | Transfer of allerts to bracelet |
Working with notifications and access to data
To make the tracker work properly, the app needs to have access to notification history. Without this right, Mi Fit won't be able to send messages from messengers to your wrist gadget. When you first start or update, the system will request this permission - be sure to confirm it.
Also check the notification settings inside the Mi Fit app itself. Go to the device profile and look for the "Application Notifications" section. Make sure the switches opposite the right programs (Telegram, WhatsApp, Phone) are active. Sometimes the MIUI system restrictions hide these settings, so you need to check them in both places.
If notifications don't come anyway, try resetting the notification settings in the smartphone itself. Go to the notification settings for the Mi Fit app and make sure the Important or Priority categories are active. This will prioritize the process in the system event processing queue.
Additional settings for developers
For advanced users who want to guarantee 100% stability, there are hidden settings in the developer menu. To get there, you need to click on the build number several times in the About Phone section. In the developer menu, find the option “Do not turn off the screen” (irrelevant) or, more importantly, settings for background processes.
However, a more effective method is to use ADB (Android Debug Bridge) to disable aggressive battery optimization if standard methods don't work. This requires a connection to a computer, but gives full control of the system.
pm grant com.xiaomi.hm.health android.permission.BLUETOOTH_ADMINUsing the ADB command line allows you to embed an application in the system-level exception list, which is especially useful if the settings have reset after the MIUI firmware update, and remember that interfering with system settings requires caution.
⚠️ Note: Change of parameters through ADB It can affect the overall stability of the system if you're not sure what you're doing.
Solving Frequent Problems and Conflicts
Sometimes, even after all the settings, the application can behave unstable, this can be caused by conflict with other memory cleaners or antiviruses. If you use third-party cleaners, add Mi Fit to their whitelist.
Bluetooth is also worth checking. In some cases, turning off and re-enable Bluetooth in your phone settings, as well as “Forget the device” in the Bluetooth menu and re-pairing through the app, helps. Don’t be afraid to re-pair the pairing procedure – this often solves problems with losing data packets.
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The main secret to stability on Redmi 9 is a combination of three actions: Autostart enabled, No Limits mode for the battery, and locking the application into the multitasking menu.
If the problem persists, try rolling back Mi Fit to an earlier version, as newer updates sometimes contain optimization errors for specific MediaTek processor models installed in Redmi 9.