How to reflash Xiaomi Redmi Note 4 via PC: a complete guide to debunking errors

Reflashing the Xiaomi Redmi Note 4 via PC is a challenge that scares many users, with fears of building up a device, losing data, or incompatible firmware, but with the right approach, it becomes as much a challenge as installing a program on a computer, and the key is to understand that PC firmware gives more control than an air-to-air update (OTA), and allows you to install both official versions of MIUI and custom builds like LineageOS or Pixel Experience.

This guide covers everything from preparing the device and unlocking the bootloader to selecting the firmware and installing it via Fastboot or Recovery. We’ll take a look at the nuances for different Redmi Note 4 modifications (including the Note 4X with a Snapdragon 625), and also warn against the typical errors that lead to a “brick.” If you’ve never flashed your smartphone before, don’t worry: the steps are detailed and supplemented with explanations of why you should do this and not do it otherwise.

1. Device Preparation: What to Do Before Firmware

The first step is the most important, but often ignored, and it depends on whether the firmware goes smoothly or ends up with an anti-rollback error or a bootloader lockdown, starting with checking the current firmware version and the status of the bootloader.

Go to Settings → About the phone and write down:

• 📱 Device model (e.g. Redmi Note 4 or Redmi Note) 4X). This is critical as firmware for Snapdragon and Helio X20 inconsistent!
• 🔢 Version MIUI (for example, MIUI Stable is required to verify compatibility with the new firmware.
• ⚙️ The build number (at the end of the About page) can be used to identify the firmware region (Global, China, EEA).

Then check the status of the bootloader. To do this, turn off the phone, press Volume down + Power and look at the screen:

• 🔓 If you see Unlocked, the bootloader is already unlocked.
• 🔒 If Locked, you will need to unlock through the Mi Unlock Tool (more about this in the next section).

⚠️ Note: If your device was purchased in China (China Stable firmware), you will need to link your Mi Account to your phone to unlock the bootloader and wait. 72–168 Global firmware devices (Global/EEA) unlock immediately.

Remember to back up your data! Fastboot wipes out all the contents of your internal memory. Use Mi PC Suite or manually copy files to your computer.

• 📁 pup DCIM (photo).
• 📱 Contacts (export to.vcf).
• 🔑 Wi-Fi passwords (save a screenshot of the network list from Settings) → Wi-Fi).

2. Unlocking the bootloader: a step-by-step guide

The bootloader on the Xiaomi Redmi Note 4 is locked by default. This is a security measure, but it also complicates the firmware. Unlocking requires a Mi Account, a Windows computer (for the Mi Unlock Tool), and a little patience.

Step 1. Linking your account to your device

1. Go to Settings → Mi Account → Sync and turn it on.
2. In Settings → Additional → For developers, activate OEM unlocking and debugging via USB.
3. Connect the phone to the PC, confirm the debugging permission on the smartphone screen.

Step 2: Installation of Mi Unlock Tool

Download the latest version of the utility from Xiaomi's official website (registration required). Install the program on your PC and run it on behalf of the administrator. Sign in with the same Mi Account as your phone.

Step 3. Unlocking

• 🖥️ Turn off the phone and put it in Fastboot mode (clip Volume down). + Nutrition).
• 🔌 Connect the device to the PC. The Mi Unlock Tool should have a Phone Connected message.
• ⏳ Press Unlock. If the device is new (linked to an account for less than 72 hours), you will see a waiting timer.

⚠️ Warning: Once the bootloader is unlocked, the smartphone will reset to factory settings. Don't be afraid, this is normal. Also note that some banking applications (such as Sberbank Online) may stop working due to an unlocked bootloader.

Linked to Mi Account on phone|On. OEM-unlocking|Drivers installed ADB/Fastboot PC-only|Download Mi Unlock Tool from the official website|The phone is charged at least to 60%-->

3. firmware selection: official MIUI vs custom builds

The type of firmware depends on the functionality, stability and even battery life of the device.

Where to download firmware:

• 🌍 Officially MIUI: Xiaomi website (select a version for your model!).
• 🛠️ Castomy: XDA Developers (Look for a theme for Redmi Note) 4/4X Device code: mido for Snapdragon, nikel for Helio X20).

Critical: Check the anti-rollback version of your current firmware. Installing an older version will lead to a "brick"! You can find it in Fastboot mode (the anti line) or through the Mi Flash app.

💡

If you are flashing custom build for the first time, select the version marked "GApps included" - it already has Google services sewn in, otherwise you will have to install them separately.

4. Firmware through Fastboot: step-by-step instructions

Fastboot is the most reliable method for installing official firmware, and it's suitable if you want to upgrade to a new version of MIUI or restore your device after a crash.

• 🖥️ Windows computer (for Mi Flash Tool).
• 🔌 Cable USB Type-C (preferably original).
• 📁 Firmware in.tgz format (unpack it into a folder without Cyrillic!).

Step 1: Installation of drivers

Download and install:

• 🔧 Android SDK Platform Tools (for fastboot teams).
• 🖱️ Xiaomi Drivers (you can take from the Mi Flash Tool package).

Check the connection by entering in the command line:

fastboot devices

If the device is displayed, the drivers are installed correctly.

Step 2: Firmware via Mi Flash Tool

1. Unpack the downloaded firmware in a folder (for example, C:\MIUI\).
2. Run the Mi Flash Tool on behalf of the administrator.
3. Click Select and point the way to the firmware folder.
4. Connect your phone in Fastboot mode (clip Volume Down + Power).
5. In the Mi Flash Tool, select the firmware method: 🔄 Clean all – complete cleaning (recommended when changing version) MIUI). 🔄 Clean all and lock - cleaning + locking the loader (only if you are sure that you will no longer be stitched!). 🔄 Save user data – data retention is not always stable).

Flash

⚠️ If the process is stalled at the waiting for device stage, check the cable and port. USB. Try using the port. USB 2.0 (they're more stable) USB 3.0 for firmware).

5. Firmware through Recovery: an alternative method

If you install custom firmware or patch (Magisk, TWRP), you will need custom recavers – for example, TWRP. This method is more flexible than Fastboot, but requires caution.

Step 1: Installation of TWRP

Download the latest version of TWRP for your model from the official website.

fastboot flash recovery twrp-3.7.0_mido.img


fastboot boot twrp-3.7.0_mido.img

The phone will then automatically reboot to TWRP.

Step 2. Firmware through TWRP

1. Copy the firmware (.zip file) to internal memory or SD-map.
2. V TWRP press Wipe → Advanced Wipe and mark: 🧹 Dalvik / ART Cache 🧹 System 🧹 Data (if you need a clean installation) 🧹 Cache

Install

Confirm the installation with a swipe and wait for completion.

For custom firmware, additional installation may be required:

• 🔑 Magisk (for root rights).
• 📱 GApps (if not in the assembly).
• 🔒 Disable Force Encryption (if the firmware does not support encryption).

Typical errors and their solutions

Even with the right instructions, there can be problems.

If the device does not respond to buttons and is not detected by the PC:

• 🔋 Check the battery charge (minimum 30%).
• 🔌 Try another cable/port USB.
• 🖥️ Reinstall drivers in Device Manager (remove device and update configuration).

💡

If the sensor or camera doesn’t work after the firmware, you probably didn’t install the firmware for your Redmi Note 4 modification. Check the device code (mido or nikel) and reflash the correct version.

7.Optimization after firmware: what to do first

Successful firmware is only half the battle, so that the device works steadily.

For the official MIUI:

• 🔄 Update all apps through Google Play.
• 🧹 Remove the Bloatwar (pre-installed games and services) with the help of ADB: adb shell pm uninstall -k --user 0 com.mi.globalminusscreen
• ⚡ Enable Advanced Power Saving Mode in Battery Settings.

For custom firmware:

• 🔧 Configure SELinux in Permissive mode (if required).
• 📡 Check the mobile network: some custom builds require manual input APN.
• 🎯 Calibrate the battery (discharge to 0% and charge to 100% without interruptions).

Don't forget to check:

• 📸 Camera operation (test all modules!).
• 🔊 Sound in the speaker and microphone.
• 📶 Speed of mobile Internet and Wi-Fi.

FAQ: Frequent questions about the Redmi Note firmware 4