How to Reflash Xiaomi Mi Band 3 NFC: A Complete Guide to Risks and Life Hacks

The Xiaomi Mi Band 3 NFC fitness bracelet is still popular even years later, thanks to its combination of functionality and price. However, over time, standard firmware can become obsolete, slow down or lose support for new chips. Flashing allows you to return the bracelet to a “second life”: install custom firmware with advanced features, fix bugs or even unlock hidden features like Mi Pay payment for informal regions.

But the process is not as simple as updating through the Mi Fit app. Here you will need to unlock the bootloader, find a compatible firmware and carefully follow the instructions so as not to turn the bracelet into a “brick”. In this guide, we will analyze all the stages of flashing – from preparation to recovery after failures – and also tell you which firmware supports. NFC-Mi Band 3 chip without loss of functionality. If you're willing to take risks for new features, read on.

Why You Should Reflash Mi Band 3 NFC

Xiaomi’s standard firmware often limits users: for example, some regions have disabled support for contactless payments via NFC, and the interface may be slower due to unnecessary background processes.

• 🚀 Unlocking NFC for payments – in official firmware for Europe and Russia, the function is often disabled, and custom assemblies (for example, Amazfit Mod) restore it.
• ⚡ Speed up work – some firmware is optimized for fast synchronization and less power consumption.
• 🎨 New dials and animations – custom firmware supports informal themes that are not in Mi Fit.
• 🔧 Bug fixes – if the bracelet is permanently off or out of sync, alternative firmware can help.

But there’s a downside: once you flash it, you lose the official warranty, and if you make a mistake, the bracelet can fail, and some custom firmware doesn’t support Mi Pay or sync with Google Fit — you need to check before installing it.

What is the best firmware for Mi Band 3 NFC

Not all custom firmware is compatible with NFC-Official updates via Mi Fit are usually safe but limited to the region:

The most common way to unlock NFC is by using Amazfit Mod, which is a modified official firmware with payment support enabled. However, check your bracelet version before installing: the firmware for Mi Band 3 and Mi Band 3 NFC is not interchangeable! You can find the version in Settings → About the bracelet in the Mi Fit app.

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Before choosing a firmware, check out reviews on the 4PDA or XDA Developers forums – some builds may conflict with specific versions of Android/iOS.

Preparation for flashing: what to do in advance

Flashing is not just about clicking the "Update" button, but to minimize the risks, follow these steps:

Download the correct firmware version (for Mi Band 3 NFC)

Install ADB drivers on your computer (if the firmware is via PC)

Charge the bracelet to 100% (risk of disconnection during the process)

Make a data backup in Mi Fit (settings, training, notifications)

Disable the antivirus (it can block firmware files)

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Pay special attention to charging the bracelet: if it runs out during firmware, it will be extremely difficult to restore it. USB-cable – cheap analogues may not provide a stable connection.

⚠️ Note: If you are using Windows, install drivers for Mi Band 3 manually through Device Manager. Without them, the computer will not recognize the bracelet in firmware mode.

To install the software through ADB (advanced) you will need:

• 🖥️ Windows computer 10/11 MacOS (Linux is partially supported).
• 🔌 Cable USB-A → Micro-USB (complete with bracelet).
• 📦 Archive with firmware and utilities (MiBand3Tools, Fastboot).

Step-by-step: firmware via Mi Fit (official method)

If you don’t need custom features, but only need an upgrade to the latest official version, use the standard method through the Mi Fit app.This is the safest option, but it won’t unlock NFC for unofficial regions.

1. Open the Mi Fit and connect the bracelet to your phone via Bluetooth.
2. Go to Profile → Mi Smart Band 3 → Update firmware.
3. If an update is available, click Download and wait until it is completed (the bracelet will reboot automatically).
4. After updating, check the firmware version in Settings → About the bracelet.

Official updates usually come out every few months, and if there is no new version in your region, try changing your region to Mi Fit:

1. In the phone settings, change the language to English (USA).
2. Remove and reinstall Mi Fit by selecting China or India region (updates are available earlier).

⚠️ Warning: Changing region to Mi Fit could lead to resetting workout statistics!

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Official firmware via Mi Fit is the only way to upgrade without the risk of bricking, but it won’t unlock NFC for payments in unofficial regions.

Flashing through ADB: unlocking the bootloader and installing custom firmware

Unofficial firmware installations (such as the Amazfit Mod) require unlocking the bracelet loader and using the Android Debug Bridge (ADB), a method that is suitable for advanced users and requires care.

Step 1 Unlocking the bootloader

1. Download and install Google’s Platform Tools (includes ADB and Fastboot).
2. Connect the bracelet to your computer via USB (it should be defined as Mi Band 3 in Device Manager).
3. Open the command line (cmd) in the folder with Platform Tools and execute: adb devices If the bracelet appears in the list, type: adb reboot bootloader
4. To unlock the bootloader, use the command: fastboot oem unlock Bracelet will reboot and reset to factory settings.

Step 2: Install custom firmware

1. Download the firmware file (for example, amazfit_mod_3_nfc.fw) And put it in a folder with Platform Tools.
2. Connect the bracelet in Fastboot mode (press the button on the bracelet when connecting to USB).
3. Firmware command: fastboot flash resource 0 amazfit_mod_3_nfc.fw
4. After completion, restart the bracelet: fastboot reboot

If the process is successful, the bracelet will turn on with a new firmware. Check the NFC through the Mi Pay app (if the feature has been unlocked).

Recovery of the bracelet after a failed firmware

If the bracelet stops turning on or hangs on the Mi logo, don't panic - in most cases it can be restored.

• 🔄 Hard reset: press the button on the bracelet for 10-15 seconds until it vibrates. Try connecting to Mi Fit again.
• 💻 Fastboot Firmware: If the bracelet is determined by a computer, repeat the firmware procedure with the official file (mi_band_3_latest.fw).
• 🔧 Mi Band 3 Tools: Mi Band 3 Tools can restore the bracelet even after a bootloader crash.

If nothing works, go to the 4PDA or XDA forums, which often post emergency firmware for bricked devices, and in extreme cases, there is a service center, but it will cost 30-50% of the cost of a new bracelet.

⚠️ Warning: If the bracelet does not respond to charging (the indicator does not burn), the problem may be in the power controller.

Frequent Mistakes and How to Avoid Them

Even when following the instructions, users often encounter problems, and here are the most common mistakes and solutions:

Another common problem is the loss of sync with the phone after installing custom firmware.

1. Remove the bracelet from the Mi Fit.
2. Reboot your phone and bracelet.
3. Connect again by selecting Mi Band 3 NFC in Mi Fit (even if you have a different firmware).

FAQ: Answers to Frequent Questions