Xiaomi Mi Band 4C — A budget fitness bracelet with a color display, heart rate monitoring and 14-day autonomy that is still a hot choice in 2026, but many users are struggling to connect the device to a smartphone for the first time. Unlike the newer models (Mi Band 7 or Smart Band 8), 4C-The version requires a special approach due to outdated firmware and limited compatibility with the latest versions of the Mi Fitness app.
In this article, you will find not only step-by-step synchronization instructions, but also decision errors (such as codes 10008 or 30004), as well as hidden settings that the manufacturer does not advertise. We tested the process on 15 different smartphones (including Xiaomi Redmi Note 12, iPhone 14 and Samsung Galaxy A54) – all steps tested for relevance in May 2026.
1. Connection Preparation: What to Check Before Synchronization
Before you start pairing, make sure your smartphone and bracelet meet minimum requirements.The Mi Band 4C officially supports:
- 📱 Android 5.0 and higher, but 7.0 is recommended+ steady-work)
- 🍎 iOS 10.0 and higher on iPhone 6s newer)
- 🔋 Bracelet charge at least 20% (at low charge synchronization may be interrupted)
- 📶 Bluetooth 4.0 or higher (check in your phone settings)
A critical mistake many users make is trying to connect through an outdated version of the Mi Fit app. Since 2023, Xiaomi has moved support for Mi Band 4C to the new Mi Fitness app (formerly Zepp Life).
| Parameter | Minimum requirement | Recommended |
|---|---|---|
| Android version | 5.0 Lollipop | 7.0 Nougat and higher |
| iOS version | 10.0 | 13.0 and higher |
| Bluetooth | 4.0 | 5.0 (for lower power consumption) |
| Free space on the phone | 100MB | 500MB (for app cache) |
Important: Mi Band 4C does not support multi-discipline synchronization. If you are trying to connect the bracelet to a second phone, first untie it from the first device through the app settings.
2. Installation and configuration of the Mi Fitness application
Official application for management of Mi Band 4C — Mi Fitness (available on Google Play and App Store) Avoid clones like Mi Band Master or Notify & Fitness - they may not support all features 4C-model.
Installation algorithm:
- Download Mi Fitness from the official store.
- Sign up for a Xiaomi account (or sign in through an existing one). Without an account, sync is impossible!
- Turn on Bluetooth and geolocation (the latter is needed for the correct operation of the pedometer).
- Allow all application requests (notifications, contact access, physical activity).
Remove the old Mi Fit app|Update the OS to the latest version|Enable Bluetooth and geolocation|Charge the bracelet to 50%+|Download Mi Fitness from the official store-->
On iPhone, after installing the app, go to Settings → Privacy → Geolocation Services and select For Mi Fitness, Always mode. On Android, you can find a similar setting in Settings → Applications → Mi Fitness → Permissions.
⚠️ Note: If you are using a Xiaomi-enabled smartphone with a shell MIUI, Turn off the dual applications feature for Mi Fitness. It can block background data synchronization.
3. Step-by-step instructions for connecting Mi Band 4C
Now, to the process of pairing, follow the instructions in strict order.
- Bracelet activation: 🔋 Press and hold the touch button under the Mi Band screen 4C within 3 seconds until the Mi logo appears. 📱 On the phone, open Mi Fitness and tap the profile icon" →"Add the device".
- Select the model: In the list of devices, select "Mi Smart Band" 4C" (Not to be confused with Mi Band 4!). 🔍 If the model is not listed, update the app or check your account region (should be “China” or “Global").
Bluetooth pairing:
- 🔄 The bracelet will have a 6-digit code, compare it to the code on the phone screen and confirm pairing.
- ⏳ Wait for the synchronization to be completed (may take up to 2 minutes).
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If the bracelet does not respond to the press of a button, plug it into charging for 10 minutes - sometimes a discharged battery blocks the activation.
4.Configure the main functions after connection
After successful synchronization, we recommend you to immediately configure the key parameters:
- ⏰ Alarms: Go to "Device Profile" → Alarm clocks. You can add up to 10 signals. Tip: use the Smart Alarm function).
- 📊 Activity objectives: B “Profile → Set daily steps (recommended value of 8000 for beginners).
- 🔔 Notifications: Include alerts for calls and messages in the "Notifications" → Notifications Management. iPhone will need to activate “Sending notifications” in Bluetooth settings.
- 🔒 Screen lock: The function of unlocking the phone through the bracelet works only on Xiaomi smartphones with a MIUI.
For accuracy of sleep data, adjust the bedtime in the "Sleep" section. The bracelet will automatically switch to sleep monitoring mode from 23:00 to 7:00 (time can be changed).
How to turn on the weather display on the bracelet screen?
| Function | How to turn it on | Limitations |
|---|---|---|
| Monitoring of heart rate | Profile → Heart monitoring → Automobile | Measure every 30 minutes (not continuously) |
| Notifications of communications | Notifications → Messages | iOS only works for SMS and calls |
| Stress management | Profile → Stress → Include | Requires manual calibration in the first 3 days |
| Don't disturb mode. | Swipe down on the bracelet screen | Disable all notifications for 1 hour |
5. Common mistakes and their solutions
Even with the right connection, users often experience crashes.-5 errors and ways of eliminating them:
- 🚫 Error 10008 ("Unconnected"): Reason: conflict with another Bluetooth device. Solution: Disable all other gadgets (earphones, speakers) and restart your phone.
- ⚠️ Error 30004 ("Device does not respond"): Reason: outdated bracelet firmware. Solution: Update the software through Device Profile → Firmware update.
- 🔄 Bracelet is constantly turned off: Reason: energy saving mode Android/iOS. Solution: Add Mi Fitness to Battery Optimization Excluded.