How to clean it up completely MIUI Xiaomi Redmi 9T: from unlock to custom firmware

Shell MIUI Xiaomi has long been a subject of controversy: some appreciate it for its abundance of features and regular updates, others criticize it for intrusive advertising, unnecessary services and not always optimal performance. 9T (Xiaomi’s internal encoding lime model and want to get rid of it MIUI Once and for all, this guide will help you do it competently. There is no universal magic way, the process requires preparation, understanding the risks and following the instructions strictly.

It is important to understand: disconnection MIUI It involves replacing the firmware with an alternative one (for example, LineageOS, Pixel Experience or other software). AOSP). It's not just removing apps or disabling ads, it's a radical change in the software platform of a smartphone. It involves unlocking the bootloader, installing a custom recavator (TWRP) Each step carries potential risks: from data loss to “bricking” the device (turning into a “brick»).

In this article, we will analyze all the stages - from preparation to final configuration - and also tell you which firmware officially supports Redmi. 9T Today (2026) and how to avoid common mistakes: If you're a beginner, we recommend that you carefully study each section before taking action.

Why Users Want to Delete MIUI redmi 9T?

Reasons for refusal MIUI Everyone's different, but most of it comes down to a few key things: first, performance: over time, the shell starts to slow down, especially on low-end models like the Redmi. 9T It's got Snapdragon 662 and 4GB of RAM. And second, advertising and data collection. Even after you turn off the customization of ads in the settings, some system applications (Mi Browser, Mi Video) continue to show banners.

Other common claims:

• 🔄 Intrusive updates: MIUI It often sends notifications about new versions, even if the user does not want to update.
• 📱 Duplicate apps: Mi Browser is installed alongside Google Chrome, Mi Messages is installed instead of Google Messages, etc.
• 🔒 System limitations: for example, the inability to disable some system services without ADB.
• 🎨 Design and animation: many people don’t like the style MIUI, Especially after updates to versions 12-14.

However, before you start replacing firmware, it is worth honestly answering the question: is it necessary? Alternative firmware (for example, LineageOS) are deprived of many “chips» MIUI, like-minded:

• 🔋 Optimized power consumption for Qualcomm processors.
• 📸 Specialized camera modes (e.g. Night Mode 2.0).
• 🎮 Game Turbo Mode (Game Turbo).
• 🔒 Built-in security tools (App Lock, Second Space).

Preparation for shutdown MIUI: What to do before you start

First and foremost, back up all the data, and the process of replacing the firmware will cause the device to reset completely, and it will be impossible to recover the information after that.

• 🖥️ Xiaomi Cloud (if you trust your Mi Account).
• 📱 Google Account (Contacts, Photos, Apps).
• 💾 Local copying on PC (photos, videos, documents).
• 🔧 Titanium Backup (Routed Devices Only).

Check out your Redmi model. 9T. The thing is, it's called Redmi. 9T There are two different modifications:

You can find out the exact code name in the settings: go to Settings → The phone. → Version. MIUI And you pop the line "Kernel Version" a few times, and you'll see a menu that says Device, like lime).

Battery charge ≥ 70%|Backup of data on PC/cloud|Drivers installed ADB/Fastboot PC-only|Downloaded firmware and TWRP for your model|Mi Account and Factory Reset Protection Disabled (FRP)

-->

It will also be necessary:

• 🖥️ Windows computer (or Linux/macOS supportive ADB).
• 🔌 Cable USB Type-C (original, undamaged).
• 📥 Firmware (LineageOS, Pixel Experience or other).
• 🔧 TWRP Recovery for lime.
• 🔑 Unlocked bootloader (more on this below).

💡

If you have never worked with ADB Or Fastboot, work out on an old smartphone or Android emulator, which will help you avoid mistakes when working with Redmi. 9T.

Step 1: Unlock the bootloader (Bootloader)

The Xiaomi bootloader is locked by default, and unlocking it is a must. TWRP The process is officially supported by Xiaomi, but has limitations:

• ⏳ Wait 7 days after linking your account to your device.
• 🔒 Link to Mi Account (be sure to remember the login / password!).
• 📱 Resetting all data after unlocking.

Instructions for unlocking:

1. Activate Developer Mode: Go to Settings → About the phone and 7 times tap on the line "Version" MIUI».
2. Back to Settings → Additionally. → For developers and include: 🔧 Debugging by USB. 🔓 Unlocking OEM.

Connect the phone to the PC and confirm the debugging permission.

official unlocker

Mi Unlock Tool

Mi Account

If you receive a waiting message, wait for the specified time (usually 168 hours).

Attention! Once successfully unlocked, the phone will automatically reset to factory settings. Don't be alarmed, that's okay. Also, remember that unlocked bootloader reduces the security of the device by allowing you to install unsigned software.

Step 2: Installation of TWRP Recovery

TWRP (Team Win Recovery Project is a custom recovery that will allow you to flash alternative firmware. 9T (use the official or recommended build from twrp.me. Low-quality or outdated versions may lead to errors.

Installation instructions:

1. Download the current.img file TWRP for lime (e.g. for lime, twrp-3.7.0_9-0-lime.img).
2. Place the file in a folder with ADB (usually C:\platform-tools).
3. Connect your phone to your PC in Fastboot mode (turn off the device, then press the Power). + Vol Down).
4. Open the command line in the folder with ADB Next Post:Fastboot Flash Recovery twrp-3.7.0_9-0-lime.img fastboot boot twrp-3.7.0_9-0-lime.img
5. The phone will reboot to TWRP. Stay with the river!

V TWRP You need to do two things at once:

1. 📁 Create a backup of the current firmware (Backup) → Select partitions (Boot, System, Data) → Swipe to confirm).
2. 🔧 Data formatting (important! this will delete all data): Wipe → Format Data → enter" → confirm.

💡

After installation TWRP The phone is loaded back into MIUI, So the firmware has overwritten the recaveri, so you need to turn off the automatic recaveri check in the MIUI (through ADB: adb shell cmd oem disable_verity).

Step 3: Selecting and Installing Alternative Firmware

On the Redmi. 9T (lime) several types of firmware are officially supported:

For beginners, we recommend Pixel Experience - it is as close as possible to the "stock" Android and has a minimum number of bugs. Download the firmware in.zip format and, if necessary, GApps (if they are not included in the build).

Installation via TWRP:

1. Place the downloaded.zip on your phone or flash drive.
2. V TWRP Choose Install → Select a firmware file → Add more. ZIP (if you need GApps) → Swipe to confirm.
3. After installation, run the Wipe → Dalvik/ART Cache.
4. Reboot to the system (Reboot → System).

⚠️ Attention! The first download can take 10 to 20 minutes — don't interrupt the process. If the screen has been stuck on the logo for longer than 30 minutes, something has gone wrong (possibly incompatible firmware or installation error).

Step 4: Set up the system after installation

After successfully downloading a new firmware, several important actions must be performed:

1. 🔧 Check the performance of the main functions: Mobile network (calls, SMS, 4G). Wi-Fi and Bluetooth. Camera (front and main) Sensors (gyroscope, accelerometer).

Update the firmware

Recover the data.

Calibrate the battery.

If something is not working (for example, NFC or IR-blaster, check it out:

• 📋 Compatibility of the firmware with your model (lime/limein).
• 🔄 Updates or patches on the forum XDA Developers.
• 🛠️ Installation Properness (Perhaps a step with Format Data is missed).

For Redmi. 9T typical problems after firmware:

Risks and how to avoid them

Replacing firmware is always a risk, and even if you follow the instructions, you can crash. Here are the most common errors and how to prevent them:

1. "Hard brick" of the device (hard brick)

It happens if:

• 🔌 Interrupt the firmware process (for example, disable the cable).
• 📥 Install firmware not for your model (lime vs limein).
• 🔧 It is not correct to format sections in TWRP.

How to recover: Use the Mi Flash Tool and flash the official Fastboot firmware from Xiaomi.

2 Loss. IMEI or serial number

Sometimes it disappears after the firmware. IMEI, The phone stops catching the network, and the reason is that the modem partition is damaged.

Decision:

• Restore IMEI Engineer Mode (code ##4636## or #36446337##).
• Switch the original modem from stock firmware.

3. Performance problems

Castom firmware isn't always optimized for the Snapdragon 662.

• 🔄 Try another firmware (e.g. LineageOS instead of HaventOS).
• 🔧 Turn off animations in Settings → For developers.
• 📵 Remove unnecessary background processes through Greenify.

💡

If you are not sure about your actions, it is better to contact an experienced user or forum. XDA. Firmware errors can cost the device!

FAQ: Frequent questions about disconnection MIUI on the Redmi 9T