Fitness trackers often think about keeping personal information stored in the device safe. Mi Band 4 is a popular model that collects health data, notifications and other sensitive information. Installing a security code is the first step to keeping your gadget safe from prying eyes. This is especially true if you wear the tracker without taking off or often leave it unattended in the locker room.
The process of activating protection does not require complex technical knowledge, but it has its own features in software. The standard procedure is carried out through the official Mi Fit application (or Xiaomi Wear), which synchronizes data with a smartphone. It is important to understand that without tethering to the phone, you can not adjust the security settings. Let's analyze in detail each stage of the setup and possible nuances of the lock system.
Preparation for the tracking security setting
Before you start installing a pin, you need to make sure that the pairing devices are working correctly. The bluetooth connection between the phone and the bracelet should be stable, since all changes are made remotely. If the connection is interrupted at the time you write the settings, the process can end in error and you will have to start again. Also make sure that the necessary permissions for the application are enabled on both devices.
It is recommended to update the tracker firmware to the latest available version in advance. Xiaomi developers regularly release patches that fix vulnerabilities and improve the stability of security functions. Old software may not support new encryption algorithms or have bugs in the password input interface.
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Before making changes to your security settings, make sure that the tracker’s battery is at least 30% in charge to avoid a sudden shutdown at a critical moment.
You need a Mi Account that you use to log in to the app, and it's through the cloud that key encryption options are transmitted, and without authorization, access to the security settings menu can be restricted or completely blocked by the system developer.
Step-by-step instructions for activating the password
The setup process is run exclusively through the mobile application interface. Open Mi Fit on your smartphone and go to the profile of your selected device. In the list of available options, you need to find the item responsible for data protection, usually located in the general settings section or in the security menu.
Once the switch is activated, the system will suggest you come up with a four-digit numerical code, which is your personal access key, which will be requested every time you put on the bracelet, come up with a combination that is easy to remember, but difficult to guess to an outsider, avoid obvious combinations like 1234 or 0000.
☑️ Checklist of activation of protection
Once the code is entered, the system will ask you to confirm the action by re-entering, a standard precaution that prevents the incorrect password from being accidentally set due to a typo, and once the codes match, the settings will be stored in the tracker's memory and activated immediately.
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The password begins to act immediately after confirmation, so the first removal of the lock will have to be done already on the wrist.
Set-up of pulse unlocking
The Mi Band 4 features a handy heart rate unlock feature, which if activated, the tracker won’t ask for a pin code every time you put it on, provided it reads your pulse, which greatly speeds up access to the device’s functions in everyday use.
This function requires that the pulse sensor be in good working order and fit tightly to the skin, that the optical sensor reads the readings in real time, and that if the bracelet is removed from the hand or worn too weakly, the system automatically requires manual code entry to confirm the identity of the owner.
- 🔒 Automatic unlocking works only at the first wear after removal.
- ❤️ Sensor must record stable heart rate to skip check.
- ⏱ If the pulse is not read for more than 10 seconds, the code request will appear forcibly.
It's worth noting that pulse unlocking uses an extra battery charge. The constant operation of the sensor in the background can reduce the battery life of the device by 10-15% per day. If you prioritize maximum duration of operation, this option can be turned off at any time.
Limitations and compatibility with iOS and Android
Security functionality can vary depending on your smartphone's operating system. Android users often have greater access to settings and get app updates faster. iPhone owners may face some restrictions related to Apple's security policy.
| Function | Android | iOS |
|---|---|---|
| Password setting | Full support | Full support |
| Pulse unlocking | It's stable. | There may be delays |
| Notifications upon blocking | Customizable | Limited. |
| Synchronization of time | Automatic. | Requires applications |
On iOS devices, there is sometimes a delay in sending lock commands, due to the peculiarities of the background processes in the Apple system, and if you notice that the settings do not apply immediately, try restarting the application or reconnecting the bracelet.
Why can there be problems on iOS?
What to do if you forget the access code
It's quite common for users to forget a pin, unfortunately, it's impossible to recover a forgotten combination of numbers for security reasons. The encryption system doesn't store your password in plain sight, so even the technical support won't be able to recognize it or reset it remotely.
The only way out of this situation is to completely reset the device to factory settings, which will delete all the accumulated data, including training history, dial settings and pairings, and when reset, the tracker will look like a new tracker that you just bought in the store.
⚠️ Warning: Resetting to factory settings permanently removes all local information from the bracelet. Make sure the data is synchronized with the cloud before starting the procedure.
To perform a reset, you usually need to pinch the touch button for a few seconds or use a special combination of actions in the menu. The exact method depends on the firmware version. Once reset, you can re-associate the device and set a new, more memorable password.
The effect of blocking on the autonomy of work
Turning on the security code, and especially the pulse unlock function, affects power consumption, and the tracker processor has to activate more often to check the status of wear and read the sensors, and although the effect is not critical, in maximum saving mode this can be noticeable.
If you're planning a long trip without charging, consider temporarily disabling the pulse unlock, leaving only manual password input when you're wearing it, and you'll reduce the load on the sensors, so you can extend the device's life on a single charge.
- 🔋 Constant monitoring of the pulse consumes charge faster.
- 📉 The screen lights up less often if you don’t need to check the owner.
- ⚙️ Background data synchronization continues in normal mode.
The optimal balance between safety and autonomy is to use a standard pin code without a constant pulse check if you are in a safe environment.In public places or the gym, it is better to activate all levels of protection.
Frequent problems and ways to solve them
Users may encounter a situation where the tracker stops asking for a password or, conversely, requires it too often, most often due to time desynchronization or malfunctions in the Mi Fit application.
Sometimes the problem is that the touchscreen of the wristband is not working properly, and if the screen is dirty or wet, it can be difficult to enter the numbers, wipe the surface with dry soft cloth and make sure that the fingers are dry, and the moisture on the screen can cause false sensor alerts.
⚠️ Warning: Do not try to enter a password with wet hands or gloves – this can lead to locking the device after several failed attempts.
If the software methods don't work, try reconnecting the device. Remove the tracker from the Bluetooth list in the phone, then re-find it and pair it through the app, which often solves the problems with handing over control commands.
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Regularly restarting the tracker (once a week) helps to clear the system cache and prevents software errors.