If you are looking for a Xiaomi smartphone in the secondary market or in foreign stores, you probably have encountered the marks “Unlocked” or “Locked” in the description. SIM-The bootloader, the key component that controls the launch of the operating system, opens the loader to the user wide opportunities for customization, but at the same time deprives him of some of the protection and warranty obligations.
In this article, we will discuss in detail what unlocked Xiaomi means, how it differs from the locked version, how to check the status of your device, and also evaluate all the pros and cons of such a solution. We will pay special attention to security issues, MIUI compatibility and potential problems when updating your firmware. If you plan to buy a used smartphone or experiment with firmware, this information will help avoid errors and unexpected consequences.
What is “Unlocked” Xiaomi: a technical explanation
The term “Unlocked” in the context of Xiaomi smartphones means that the bootloader of the device is unlocked. The bootloader is a low-level program that runs to the operating system and is responsible for loading it. In the locked state, it checks the digital signatures of the firmware, blocking the installation of unofficial software. Unlocking removes this restriction.
The unlocking process is officially supported by Xiaomi through the Mi Unlock Tool, but requires a Mi Account and wait (usually 7-14 days) after unlocking, the user can:
- 📱 Install custom firmware (e.g. LineageOS, Pixel Experience)
- 🔧 Get root rights through Magisk or SuperSU
- 🔄 Modify system files (kernels, recovery, modules)
- 🛠️ Restore Bricked Devices via Fastboot
It is important to understand that unlocking the loader ≠ unlock SIM-The latter refers to the device-to-operator binding (e.g., MegaFon or Beeline smartphones), whereas the unlocked bootloader is a technical opportunity for deep system customization.
Locked vs Unlocked: Key Differences
To see if you should buy the unlocked Xiaomi, compare it to the locked version by the main criteria.
| Parameter | Locked (locked) | Unlocked (unlocked) |
|---|---|---|
| Installation of custom firmware | ❌ Impossible. | ✅ Perhaps (via Fastboot or TWRP) |
| Root rights | ❌ Impossible without unlocking. | ✅ Maybe (via Magisk) |
| MIUI OTA Updates | ✅ Automatic. | ⚠️ May not come or require manual installation |
| Security | ✅ High level (signature verification) | ⚠️ Risk of installing malware |
| Guarantee | ✅ It's still there. | ❌ Cancellation (official position of Xiaomi) |
Critical: unlocked bootloader does not always mean that the device is custom firmware. Often sellers simply unlock the bootloader, but leave the stock MIUI. However, even in this case, the system can behave unstable due to the lack of integrity check.
⚠️ Note: Some models (e.g. Xiaomi) 12T Or the Redmi Note 11 Pro.+) unlocking the bootloader leads to blocking the encryption of the data, which means that after resetting the settings, all files in the device's memory will be permanently deleted.
How to check if the bootloader is unlocked on your Xiaomi
If you have already bought a smartphone or are considering buying it, it is important to know the status of the bootloader.
- Using Fastboot mode: Turn off your smartphone. Press the Power button + Volume down until the Fastboot logo appears. Connect the device to your PC and type in the command: fastboot oem device-info Find the Device unlocked: true string - if there is one, the bootloader is unlocked.
- Through MIUI settings (for some models): Go to Settings → About Phone → MIUI version and tap 7 times on the kernel version line. If the message appears Bootloader unlocked, the device is unlocked.
- Through apps: Install Mi Check Tool or Bootloader Status from Google Play. They will show status without a PC connection.
☑️ Checking the status of the loader
On some models (such as the POCO F3 or Redmi K40) after unlocking in the Fastboot, an ORANGE STATE warning appears – this is normal and means that the bootloader is unlocked, but the device did not pass the integrity check.
The advantages of unlocked Xiaomi: why is it necessary?
Despite the risks, unlocking the bootloader has a number of benefits, especially if you like experimentation or want to get the most out of the device.
- 🚀 Custom firmware: The ability to install LineageOS, Pixel Experience or AOSP-Firmware with pure Android without excess software from Xiaomi.
- 🔧 Root access: Full system control – removing bloatware, fine-tuning the kernel, changing DPI screen.
- 🔄 Recovery after the “brick”: If the smartphone stopped turning on due to a failed update, the unlocked bootloader allows you to reflash it through Fastboot.
- 📱 Portrait Modifications: Installation of cameras from other devices (e.g. ported GCam for improved shooting).
- 🔋 Battery optimization: You can turn off unnecessary services through Magisk, extending your work time.
For enthusiasts and developers, unlocked Xiaomi is like a sandbox for experimentation. For example, on the POCO X3 Pro with an unlocked bootloader, you can install firmware with 5G support even on models where this feature is officially disabled.
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If you unlocked the bootloader, but want to return the warranty, you can re-block it through the Mi Flash Tool (requires the official firmware and account associated with the device).
Risks and disadvantages: why not unlock the bootloader
Despite the freedom of action, the unlocked Xiaomi has serious disadvantages that can outweigh all the advantages.
⚠️ Note: Some security features do not work on devices with unlocked bootloader MIUI, including: 🔒 Find Device (search and block through Mi Account) 🛡️ App Lock (Blocking Applications) 📱 Second Space (Second Work Profile) This is because the system cannot guarantee the integrity of the OS.
Other significant shortcomings:
- ❌ Loss of warranty: Official Xiaomi service centers refuse repairs if unlocked bootloader is detected.
- ⚠️ Problems with OTA-Updates: Stock Stock MIUI It can stop updating automatically, and manual installation is fraught with errors.
- 🐞 Unstable operation: Castom firmware often contains bugs, especially on newer models (e.g. Xiaomi 13 Ultra).
- 🔓 Security vulnerabilities: Without checking firmware signatures, the device becomes an easy target for malware.
For example, users of the Redmi Note 10 Pro with an unlocked bootloader often face spontaneous reboots after installing unofficial cores. and Mi 11 owners complain about the lack of encryption, which makes data on the device vulnerable to theft.
What happens if you upgrade MIUI on an unlocked Xiaomi?
Can I return the guarantee after unlocking?
Officially, no. Xiaomi makes it clear that unlocking the bootloader will void the warranty, but there are workarounds that sometimes work:
- bootloader unlock: You can return locked status via the Mi Flash Tool by having an official MIUI with the clean all and lock option. But: You need an account that originally unlocked the device. On some models (for example, Xiaomi 12), this leads to an IMEI reset.
Resetting the unlock counter:
Some service centers (unofficial) can reset the anti-rollback counter, but this is risky and can lead to complete data loss.
Contacting the service under the pretext of hardware malfunction:
If the problem is not related to the software part (for example, a broken screen or a broken speaker), some SCs may turn a blind eye to the status of the bootloader.
Important: Even if you managed to lock the bootloader back, Xiaomi can determine whether the device has been unlocked by the device logs. For example, on the POCO F4 GT, the bootloader status information is stored in a special persist section that is not reset when you are firmware.
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The only reliable way to keep the guarantee is not to unlock the bootloader at all. All other methods are temporary and can be detected during diagnosis.
How to safely buy used Xiaomi with unlocked bootloader
If you decide to buy an unlocked Xiaomi in the secondary market, follow these rules to avoid problems:
☑️ Checking Xiaomi before buying
Please note the following red flags:
- 🚩 The seller does not know why the bootloader was unlocked (“that’s how they sold it” / “I don’t remember»).
- 🚩 The device has custom firmware, but the seller claims that it is “official”. MIUI».
- 🚩 B Settings → There is no information about the phone version MIUI Or she's suspiciously old.
- 🚩 The smartphone does not pass the test IMEI at imei.info.
If you are buying a device for everyday use, it is better to choose a locked version.Unlocked smartphones are only suitable for power users, ready for potential issues with updates, security and stability.