Mi Band 4 transfer to another Xiaomi phone: full instructions with solutions to typical errors

Introduction: Why Mi Band 4 Reconnection Needs Special Attention

The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular wearables due to its price-to-function ratio. However, many users face difficulties when trying to transfer the gadget to a new smartphone – especially if both devices are from Xiaomi. The problem is compounded by the fact that the standard procedure for unconnecting through the Mi Fit application often works incorrectly: the bracelet can remain tied to the old phone even after being deleted from the account, and attempts to sync with the new device end with errors like “failed to connect” or “Device is busy”.

In this article, we will discuss three official ways to reconnect (via the app, reset the bracelet and manually untie the account), and also look at undocumented techniques for cases where standard methods do not work. Particular attention will be paid to the nuances of working with Xiaomi phones on MIUI, where there are often conflicts due to duplicate Mi Account accounts or power saving restrictions. If you have already tried to transfer the bracelet and received an error, at the end of the article there is a section with solutions for 90% of typical problems.

Preparation for reconnection: what to do before the bracelet is untied

Before you start resetting or transferring the Mi Band 4, follow a few critical steps that can result in loss of data (steps, pulse, sleep history) or locking the bracelet due to account conflict.

• 📱 Check out the Mi Fit version. Outdated versions of the app (below 4.6.0) don't support the correct unbundling. Update it via Google Play or App Gallery (for Huawei).
• 🔄 Sync the data. Open Mi Fit, go to the bracelet profile and wait for full sync (the cloud icon in the upper right corner should disappear).
• 🔋 Charge the bracelet. The charge level should be at least 50%. At low charge, the Mi Band 4 can interrupt the reset process and lock down.
• 📡 Turn off power saving. On Xiaomi phone, add Mi Fit to autostart and battery optimization exceptions: Settings → Annexes → Application management → Mi Fit → Battery → No restrictions.

If you are using Xiaomi with MIUI 12+, check the autorun permission settings for Mi Fit. In newer versions of the firmware, the system aggressively blocks background application activity, which interferes with synchronization.

1. Go to Settings → Applications → Application Management → Mi Fit → Permissions.
2. Activate all switches, including Auto Run, Notifications Display, and Exact Location (yes, even if GPS is not in use).
3. In the Other Permissions section, enable Display over other windows.

Method 1: Standard uncoupling via the Mi Fit application (works 70% of the time)

This is the easiest method, but it only works if:

• 📲 You have access to an old phone with a bracelet tied.
• 🔄 Mi Fit on old phone runs error-free and sees Mi Band 4.
• 🌐 Both phones use one Mi Account (or the bracelet is not tied to the account).

If all conditions are met, follow the instructions:

1. Open Mi Fit on your old phone.
2. Go to the profile of the bracelet (stamp its icon on the home screen).
3. Scroll down and select Untie the device (or Remove the device in newer versions).
4. Confirm the action. The bracelet vibrates and resets.

After the junction:

1. Install Mi Fit on your new Xiaomi phone and log in with the same Mi Account.
2. Click Add Device and select Mi Smart Band 4.
3. Follow the instructions on the screen. The bracelet must be automatically determined.

Synchronized all data |Mi Fit updated on both phones | Bracelet charged >50% | Energy saving for Mi Fit disabled | One Mi--> account used

⚠️ Warning: If the bracelet is not detected on the new phone after unbundling, try restarting Bluetooth on both devices. On Xiaomi, it's done like this: Settings → Connections and sharing → Bluetooth → ⚙️ → Reset.

Method 2: Forced reset of Mi Band 4 (if the standard method does not work)

If the bracelet doesn't untie through the app or you lose access to your old phone, you'll have to do a hardware reset, which erases all the data from the bracelet, but puts it back in a boxy state.

Resetting instructions:

1. Remove the bracelet capsule from the strap.
2. Find the button on the back (a small recess next to the charging contacts).
3. Connect the bracelet to the charger.
4. Hold the reset button for 15-20 seconds until you feel the vibration and see the Mi logo on the screen.

After discharge:

• 🔄 The bracelet will automatically reboot and show the code for pairing.
• 📱 On the new Xiaomi phone, open the Mi Fit and add the device as new.
• ⚠️ If the bracelet is not detected, check that the phone is enabled Bluetooth 4.0+ Power saving mode for Mi Fit is turned off.

Method 3: Manually remove the bracelet from your Mi Account (for power users)

If the bracelet stubbornly refuses to untie and gives an error “The device is occupied by another account”, the problem lies in the binding to the Mi Account, in which case manual removal of the device from the Xiaomi profile will help.

Warning: This method requires access to the old Mi Account to which the bracelet was attached. If you do not remember the login details, restore access through the official Mi Account website.

1. Go to the Mi Account website and log in.
2. Select Device Management (or Mi Cloud → Devices)
3. Find the Mi Smart Band 4 and click Delete.
4. Confirm the action via SMS or email.

After deleting, wait 5-10 minutes (Xiaomi servers sometimes delay sync) and try connecting the bracelet to the new phone. If the error persists, double reset:

1. Reset the bracelet through the button (see Method 2).
2. Remove Mi Fit from your new phone, reinstall and log in again.
3. Repeat the connection attempt.

💡

If you have two Xiaomi phones on the same Mi Account, temporarily log out of your account on your old device before reconnecting the bracelet.This will prevent synchronization conflict: Settings → Mi Account → Sign out

Solving Common Mistakes When Reconnecting Mi Band 4

Even if you follow instructions correctly, users often encounter errors, and here is a list of the most common problems and ways to fix them.

Mistake: "Can't connect. Try again."

Reasons:

• 📶 Unstable Internet connection on the phone.
• 🔄 Mi Fit version conflict (different versions on old and new phones).
• 🛡️ Antivirus Blocking (on Xiaomi it can be Security App).

Decisions:

1. Switch your phone to mobile internet (sometimes Wi-Fi blocks the connection).
2. Remove Mi Fit from both phones, install the latest version and try again.
3. Temporarily disable the antivirus and VPN (if you use it).

Error: “The device is occupied by another account”

This error means that the bracelet is still tied to another Mi Account.

• 🔑 Use Method 3 (Manual Deletion from Account).
• 📧 If your account is not yours (for example, the bracelet was purchased by a used one), contact the previous owner to unbundle.
• 🔧 In extreme cases, perform a complete reset of the bracelet (Method 2) and wait 24 hours - sometimes Xiaomi servers automatically remove the binding.

Error: Bracelet connects, but data is not synchronized

Checklist for elimination:

Bluetooth enabled and stable |Mi Fit added to power saving exceptions |Automatic timing enabled |Mi Fit version no lower than 4.6.0| Bracelet charged >30%-->

If the problem persists, try forced synchronization:

1. Open the Mi Fit and go to the bracelet profile.
2. Pull the screen down for manual updates.
3. If it doesn’t work, log out of your Mi Fit account and log in again.

💡

The most common cause of sync problems on Xiaomi is aggressive battery optimization in MIUI. Even if you added Mi Fit to the exceptions, check the AutoStart and Background Activity settings for the app.

Transferring data from Mi Band 4 to a new phone: what is saved and what is not

Many users fear that when they reconnect the bracelet, they will lose their activity history, and we will figure out what data is stored and what data will have to be re-accumulated.

Critical information: If you have used Mi Band 4 with different Mi accounts (e.g., at work and at home), the data from these accounts will not be combined.

To avoid data loss:

• 📊 Export your history manually through Mi Fit (profile section) → Export of data).
• 🔄 Use one Mi Account on all devices.
• 📱 Synchronize the bracelet at least once every 2-3 days so that data goes to the cloud.

FAQ: Frequent questions about Mi Band 4 reconnection