How to unlock Xiaomi Redmi 9T: from bootloader to Mi Account

Xiaomi Redmi 9T is one of the most popular budget smartphones, but even it is not immune to lock problems. Have you forgotten the pattern lock? bought the phone with your hands and can not log into the previous owner's Mi Account? Or want to install custom firmware but encounter a locked bootloader? In this article, we will analyze all the current ways to unlock the Redmi 9T - from official methods to workarounds for experienced users.

It is important to understand that unlocking procedures fall into three categories: resetting the lock screen (if you forgot the password), removing the binding to the Mi Account (if the phone requires the username of the previous owner), and unlocking the bootloader (to install unofficial software). Each case requires a different approach - there is no universal solution. We will describe each method in detail, specify the risks and give recommendations for security.

Before you start, check your device model: unlocking for Redmi 9T (codenamed lime) may be different from the procedures for Redmi 9 or Redmi Note 9T. Make sure you have this model – information can be found in settings (Settings → Phone → Model) or under the battery (on the sticker).

1. unlock the screen (if you forgot the password or pattern lock)

The most common problem is a locked screen due to a forgotten screen. PIN-A code, password or pattern lock. 9T There are several ways to solve this problem, but not all of them will save your data.

If you have logged in to your Mi Account on this phone at least once and remember your username/password, the easiest way is to use the Find Device feature:

• 🌐 Go to i.mi.com and log in.
• 📱 Choose your Redmi. 9T device-list.
• 🔓 Click Unlock the screen and confirm the action.
• 📲 The phone is unlocked remotely (internet connection required).

If this method doesn’t work (for example, there is no link to the account or no Internet connection), you will have to do a hard reset using Recovery Mode, and note that this method will completely remove all data from the phone, including photos, contacts and apps:

1. Turn off the phone with a long press of the power button.
2. Press Volume Up + Power Button at the same time and hold for 10-15 seconds until the Mi logo appears.
3. In the Recovery menu, select Wipe Data (use volume buttons for navigation, power button for confirmation).
4. Confirm the reset by selecting Confirm.
5. After completion, select Reboot.

⚠️ Note: After hard reset, the phone may require data input from the previous Mi Account if it was tied.This is Xiaomi protection from theft – it is extremely difficult to get around it without the data of the previous owner.

2. deletion of Mi Account (if the phone requires the username of the previous owner)

If you bought a Redmi 9T handheld and it requires a username/password from the previous owner’s Mi Account, this is a serious problem. Xiaomi uses a hard-to-refer device to an account as protection against theft.

• 📩 Previous owner will delete the device from his account on account.xiaomi.com.
• 📄 You have a check or a sales contract and you can contact Xiaomi to help you unlock the device.

If you can't contact the previous owner, there are still informal methods that require unlocking the bootloader and firmware on the phone via Fastboot or EDL Mode, which are risky procedures that can:

• 🚨 Lead to a blink (complete inoperability) of the phone.
• 🔄 Drop it. IMEI (phone will stop catching the network).
• 🛡️ Deprive the guarantee (if it is still valid).

One way to work is to use the Mi Flash Unlock utility paired with firmware via EDL Mode.

• 💻 Computer with Windows and Qualcomm drivers installed.
• 🔌 Cable USB (preferably original).
• 📦 Firmware for Redmi 9T (version lime_global_images...).
• 🔧 Mi Flash Tool and patch to bypass account verification.

⚠️ Attention: Firmware through EDL Mode requires short circuits on the phone board, and without soldering experience, there's a high risk of damaging the motherboard.

Download the firmware for Redmi 9T (lime)

Install Qualcomm and Mi Flash Tool drivers

Prepare a screwdriver and a mediator for disassembling the phone

Backup of important data (if the phone is partially working)

Charge your phone at least 50%

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3. Unlocking the bootloader (bootloader) for installing custom software

If you want to install custom recovery (like TWRP) or alternative firmware (like LineageOS), you first need to unlock the bootloader. Xiaomi officially allows this, but the process takes time and requires a binding to Mi Account.

Official instructions from Xiaomi:

1. 📱 On the phone go to Settings → About the phone and 7 times click on the version MIUI, activate the developer mode.
2. 🔧 Back to Settings → Additionally. → For developers and include OEM-unlocking and debugging USB.
3. 🖥️ Download and install Mi Unlock Tool on PC.
4. 🔗 Link your Mi Account to your phone in your account settings.
5. 📶 Connect your phone to your PC in Fastboot mode (clip Volume Down) + Power with the phone turned off).
6. 🔓 Launch the Mi Unlock Tool, log in to your account and follow the instructions.

Important nuances:

• ⏳ Official unlocking takes 72–168 hours (3–7 days) of waiting after the first account link.
• 🔄 After unlocking all data from the phone will be deleted.
• 🔒 Some firmware (such as Chinese versions) may not support unlocking.

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If the Mi Unlock Tool gives you an error such as “Couldn’t verify device” or “Account is not bound to this device”, try re-assigning your account, restarting your phone and trying again after 24 hours.

4.Blocking bypass through Fastboot and EDL modes

If the official methods don’t work, power users can try unlocking Redmi 9T through low-level Fastboot and EDL modes. These methods require technical skills and are only suitable in extreme cases.

Unlock via Fastboot (if the bootloader is already unlocked):

fastboot flashing unlock


fastboot reboot

If the bootloader is locked, you must first obtain permission through the Mi Unlock Tool as described above.

Firmware via EDL Mode (to delete Mi Account):

1. Take the phone apart and find test points on the motherboard (usually signed by EDL or TEST).
2. Close the points with tweezers or wire while connecting the phone to the PC.
3. The device manager should appear Qualcomm HS-USB QDLoader 9008.
4. Start the Mi Flash Tool, select the firmware and press Flash.

⚠️ Warning: Failure to close test points can cause the power unit or processor to fail. If you're not sure, don't risk it. The cost of repairing after such an error often exceeds the price of the Redmi itself. 9T.

5. Alternative methods: exploits and custom firmware

For some versions of MIUI, there are exploits that allow you to bypass the lock without unlocking the bootloader. For example, the DirtyCOW vulnerability worked on older versions of Android, but on Redmi 9T (with Android 10/11) it is already closed.

• 🐞 CVE-2022-20007 — vulnerability MIUI 12.5, password-resetting ADB.
• 🔓 MIUI Downgrade Exploit – rollback to the old version of the firmware followed by unlocking.

Another option is to install custom firmware with already removed restrictions. 9T:

• 📱 LineageOS 18.1 (Android 11) – pure Android without Xiaomi services.
• 🔄 Pixel Experience – firmware with Google Pixel interface.
• ⚡ Havoc-OS - customizable firmware with advanced settings.

To install custom firmware you will need:

1. Unlocked bootloader.
2. Installed Custom Recovery (TWRP for Lime)
3. Redmi 9T compatible firmware (check out XDA-Developers or 4PDA forums).

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Installing custom firmware will void the warranty and may cause the phone to run unstable.Be sure to check reviews about a particular build on thematic forums before you install the firmware.

6. Frequent errors and their solutions

When you unlock Redmi 9T, users often encounter common errors.

If after unlocking the bootloader, the phone stopped booting, try:

1. Install the official firmware through the Mi Flash Tool (choose the clean all option).
2. Check if the IMEI has crashed (if there is no network, restore the IMEI via the SN Write Tool).
3. If the screen is black, but the phone vibrates, the display plume may have been damaged.

7.How to avoid blocking in the future

To avoid locking problems on Redmi 9T, follow the following simple rules:

• 🔐 Use a fingerprint or facial recognition in addition to PIN-code.
• 📝 Write your Mi Account passwords to a secure location (for example, a password manager).
• 🔄 Regularly do backup data through Settings → System system → Backup.
• 📱 Before selling your phone, be sure to remove it from your Mi Account and make a reset.
• 🛡️ Do not install firmware from unknown sources – this can lead to blocking IMEI.

If you are buying Redmi 9T from hand, be sure to check:

• 🔓 No binding to Mi Account (ask the seller to reset the phone with you).
• 📋 Status. IMEI (Type *#06# and compare it to the box).
• ⚡ Performance of charging and all sensors.

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To check if the bootloader is unlocked on Redmi 9T, turn off the phone, press Volume Down + Power to log into Fastboot. If there's Unlocked at the bottom of the screen, the bootloader is unlocked.

Frequently Asked Questions (FAQ)