Unlocking the bootloader Xiaomi Mi 9: the official method with a guarantee of success

The Xiaomi Mi 9 is still a popular flagship among Android customization enthusiasts, but its potential is only unlocked after unlocking the bootloader. Without it, you can’t install custom receivers, get root rights, or flash alternative firmware like LineageOS or Pixel Experience. However, the process of unlocking to the Mi 9 (codenamed cepheus) has nuances that distinguish it from other Xiaomi models.

In this article, the guideline for 2026, which is relevant to the latest changes in Xiaomi policy (including mandatory binding of the Mi Account and waiting time limits), we will examine not only the standard procedure through the Mi Unlock Tool, but also alternative methods for cases where the official tool refuses to work. Particular attention is paid to the risks of blocking the account and how to avoid them – this is critical for the Mi 9, since the model often falls under “gray” restrictions due to its popularity in the secondary market.

Why unlocking the bootloader on the Mi 9 is different than other Xiaomi

Xiaomi Mi 9 smartphone was released in 2019, and since then the company has repeatedly tightened the rules of unlocking.

• 🔒 Mi Account binding: From 2021, unlocking will only be possible through an account that has been active on the device for at least 72 hours (previously 24 hours), a rule that applies to the Mi 9, despite its age.
• ⏳ Wait 168 hours: After the first attempt to unlock, Xiaomi blocks re-actions for 7 days (even if the process is interrupted).On the Mi 9, this timer is reset only after successful unlocking or a complete reset via Fastboot.
• 📱 On the Mi 9, unlocking is possible only with the official global version (MIUI Global) or Chinese (MIUI China) firmware. European (MIUI EU) Custom assemblies block access to Mi Unlock Tool.

Another nuance is that the Mi 9 is the first model to support Anti-Rollback Protection (ARB), which means that once unlocked, you can’t flash old firmware versions (for example, roll back from MIUI 14 to MIUI 12), otherwise the device will turn into a “brick.” Check the current version of ARB in the settings (Settings → About Phone → MIUI Version) – it must match the firmware version you plan to install later.

Preparation of the device: 5 mandatory steps before unlocking

Incorrect preparation is the main reason for failure. On the Mi 9, it is especially important to complete all items in the specified order, otherwise the Mi Unlock Tool will give an error "Couldn't unlock" or "Current account is different from the account info on the device."

1. Attach Mi Account: Go to Settings → Xiaomi Account and log in. Make sure Device Status shows "Device is tied." If not, reboot your phone and check again.
2. Activate debugging on USB: Turn on Developer Mode (7 times click on Version) MIUI In Settings → About the phone, then go to Settings → Additionally. → For developers and include: 🔌 Debugging by USB 🔓 Unlocking OEM (point-of-point!) 🔄 Factory Unblocking (if any)

Update the firmware to the latest version

The Mi 9 bootloader blocks unlocking on older versions of MIUI. Check for updates in Settings → System Update. If there are no updates, download the latest firmware for cepheus from Xiaomi's official website and install it through Recovery.

Linked to Mi Account (72+ hours)| USB | Debugging enabled |OEM |OEBlocked Latest firmware installed |Battery charged ≥50%-->

After completing all the steps, do not turn off the Internet or log out of your Mi Account, this will reset the waiting timer. SIM-Maps or resets: Xiaomi captures such actions as an attempt to bypass restrictions.

⚠️ Warning: If you bought the Mi 9 handheld, make sure the previous owner untied your Mi Account through Settings → Xiaomi account → Delete your account, otherwise it will be impossible to unlock it without your data.

Unlocking with Mi Unlock Tool

This is the only way Xiaomi supports, but it doesn't always work.

• 💻 Windows PC 7/10/11 (MacOS and Linux Mi Unlock Tool not running)
• 🔌 Original. USB-cable (cheap cables often don’t transmit data to Fastboot)
• 📱 Battery charge ≥50%
• 🔐 Mi Account with phone-linked ≥72 hours

Download the latest version of the Mi Unlock Tool from the official website (avoid third-party sources - they often distribute outdated or modified versions).

1. Launch the Mi Unlock Tool on behalf of the administrator and log in to the same Mi Account that is linked to the phone.
2. Put Mi 9 to Fastboot: (a) Turn off phone b) Press Power button + Volume down for 10 seconds in) Connect phone to PC – the screen will appear hare in a hat-eared (Fastboot logo)

Once successfully unlocked, the phone will automatically reset to factory settings. Don't interrupt this process - even if the screen goes out for 5-10 minutes. The first boot after unlocking can take up to 15 minutes.

Alternative Unlocking Methods (If Mi Unlock Tool is Not Working)

If the official tool is giving you bugs like "Couldn't verify device" or "Device is locked," try these methods. They're less reliable, but they often save Mi 9 owners with "gray" firmware or blocked accounts.

Method 1: Unlocking with EDL (Emergency Download Mode)

This works if the phone is not loading or the Fastboot is not available.

• 🔧 Authorized Xiaomi Account for EDL (You can buy it on forums like XDA or 4PDA)
• 💾 Firmware for cepheus in.mbn format
• 🖥️ Mi Flash Tool or QFil

Instructions:

1. Turn the phone to EDL mode: (a) Turn off the phone b) Press the Power button + Volume up + Volume down 10-15 seconds in) The screen will remain black, but the PC must identify the device as Qualcomm HS-USB QDLoader 9008
2. In the Mi Flash Tool, select the firmware and press Flash. Once completed, the phone will restart with the bootloader unlocked.

⚠️ Attention: Use EDL Xiaomi can lead to hard-brick without authorization, a method recommended only for advanced users.

Method 2: 168 hours bypassing the MIUI reset

If the Mi Unlock Tool requires you to wait 7 days, but you don’t want to wait, you can reset the timer:

1. Make a backup copy of the data (they will be deleted!).
2. Go to Settings → Additional → Recovery and Reset → Resetting.
3. After reset, re-link your Mi Account and try unlocking again - the timer will reset.

This method doesn’t always work, as Xiaomi can recognize a second attempt and block an account for 30 days.

Table: Common mistakes and their solutions

What to do after successful unblocking

An unlocked bootloader offers a lot of opportunities, but it also increases the risks.

• 🔄 Install custom Recovery: Recommended TWRP for Mi 9 (version 3.7.0 Download the image from the official website TWRP Fastboot: Fastboot Flash Recovery twrp-3.7.0-cepheus.img
• 🛡️ Create a backup of the persist section: On Mi 9 This section contains critical data for the module. Wi-Fi/Bluetooth. Losing it will lead to a broken wireless connection. TWRP: Backup → Choose persist → Swipe to Back Up.
• 📱 Download the latest version of Magisk from GitHub and install it through TWRP. For the Mi 9, avoid the newer versions of the 26.1 – they may conflict with the kernel.

fastboot getvar anti

If you plan to install custom firmware (like Pixel Experience), check the forum reviews first - some builds have camera issues (due to the closed source Sony IMX586) or NFC drivers.

Risks and how to minimize them

Unlocking the bootloader on the Mi 9 is a relatively safe process, but there are nuances:

• 🔋 Loss of warranty: Xiaomi officially states that unlocking will void warranty.However, in practice, service centers often turn a blind eye if the problem is not software related (e.g., a broken screen).
• 🚨 Account Lock: If you fail to unlock frequently, Xiaomi may block your account for 30 days.To avoid this, use the same account at all stages and do not change your account. SIM-map.
• 📉 Decreased performance: Some custom firmware (especially Android 13-based ones)+) They can work slower than the stock. MIUI Unoptimized drivers for the Snapdragon 855.

To reduce the risks:

1. Always do the persist, modem, and EFS backup before experimenting.
2. Use only trusted firmware sources (Xiaomi official website, XDA Developers, 4PDA).
3. Before firmware check hash files (MD5) - this will save you from "broken" assemblies.

💡

On the Mi 9, unlocking the bootloader does not affect the main camera (48 MP), but can disrupt the wide-angle module and macro shooting in some custom firmware, which is due to Xiaomi's closed imaging libraries.

FAQ: Frequent questions about unlocking the Mi 9