Open lock on the screen Xiaomi: decoding the indicator

Many owners of Xiaomi, Redmi and POCO smartphones face a situation where, after a full reboot of the device or turning on the screen, a specific icon in the upper left corner appears in the form of an open lock. This symbol is not a standard element of the MIUI or HyperOS interface for the average user, which often causes bewilderment and concerns about the security of the gadget. The appearance of such a marker directly indicates that the system activates extended access rights, known as Root rights, or the debugging mode over USB with certain security parameters is enabled.

Unlike a closed lock, which symbolizes the full protection of the bootloader and the integrity of the system partitions, an open lock indicates a potential vulnerability. The operating system warns the user that the current configuration allows you to make changes to critical Android files. MIUI and other Xiaomi shells use this visual signal to inform the owner of the reduced level of data protection.

There are several reasons why this icon might be coming right now, and it's possible that you or someone you know has recently manipulated system settings, tried to install customized recavators, or unlocked a flashing bootloader, and in some cases, activating the developer mode can also trigger notifications if the status monitoring option is enabled.

The main value of the indicator of an open lock

The appearance of an open lock in the status bar is not a display error or a graphical shell bug. It is a standard firmware reaction to a change in the status of the bootloader. In the normal, factory state, the bootloader is blocked by the manufacturer to prevent unauthorized access to the system partition, which ensures that no malware can replace system files during the start-up phase of the device.

When a user unlocks the bootloader officially through Mi Unlock or uses exploits to obtain superuser rights, the status changes. The system marks the partitions as "non-standard" or "modified." An open lock in this context means that the integrity check at start was successful, but it confirmed that the signatures of the system files are different from the factory ones or that the protection is weakened.

It is important to understand the difference between simply enabling a developer mode and having Root rights. Developer mode itself, enabled via Settings → About Phone → MIUI version (7 clicks), should not cause a lock to appear. However, if the Developer menu activates items related to emulating a location or debugging over USB in conjunction with an unlocked bootloader, the indicator can become visible.

It is worth noting that on some global firmware versions, this icon can be hidden by default even when the bootloader is unlocked, unless special patches or Magisk modules are installed. In the Chinese versions of HyperOS or MIUI China, the security status indication is often more detailed and noticeable to the user.

Link to Superuser Rights and bootloader Unlocking

The most common reason for an open lock is the presence of Superuser or Root rights, which allow the user to modify any files in the system, delete preinstalled applications and install modified versions of programs.

The process of unlocking the bootloader on Xiaomi devices requires you to link your Mi Account and wait a certain period of time (7 to 30 days). After successfully unlocking through your computer, every time you turn on the phone for a few seconds, a warning appears that the device is unlocked, and often at this point or immediately after booting the system, an open lock icon appears, this is a visual confirmation that the Bootloader protection is disabled.

⚠️ Warning: Having superuser and unlocked bootloader rights makes your device vulnerable to ransomware. Malware can gain full access to your photos, contacts and banking applications as system barriers are removed.

If you haven’t done any modifications to the system, but the icon has appeared, it may indicate that the phone was purchased with the bootloader already unlocked (the so-called “Global ROM” version on Chinese hardware, flashed by the seller).

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You can check the status of the bootloader by going into Fastboot mode. To do this, turn off the phone and press the volume "minus" and power buttons at the same time. In the upper corner of the screen, it will say "LOCKED" (locked) or "UNLOCKED" (unlocked).

Impact on data security and banking applications

Having an open lock and, as a result, an unlocked bootloader or Root rights directly affects the operation of applications with increased security requirements. Banking programs such as SberBank, Tinkoff, as well as payment systems Google Pay (now GPay) and Mir Pay, use Google Play Protect and SafetyNet (now Play Integrity API) to check the environment.

If the system detects that the bootloader is unlocked (open lock), it marks the device as unsafe.

• 📉 Banking applications may refuse to run or hide the transfer function.
• 💳 Payment systems NFC stop working because card tokenization requires a secure element.
• 🎮 Some games with anticheat (for example, Pokémon GO Online Shooters or Shooters may not be launched.
• 📺 Streaming Services (Netflix, Disney)+) may reduce the quality of reproduction to SD (480p) forfeiture of certificates DRM.

SafetyNet technology is a system integrity checker, an open lock signals that the trust chain is broken, and for ordinary users who don't fine-tune the system, it creates more problems than benefits, especially when mobile banks require a high degree of transaction security.

How to hide the icon and restore system security

If you have an open lock that confuses or interferes with the application, the only complete solution is to return to the factory state, which involves locking the bootloader and returning the original firmware, a process that is risky and requires care, as an error can lead to complete failure of the device (brick).

The first step should always be to back up all important data, as locking the bootloader completely removes all data from the phone (Wipe Data), after which you need to download the official firmware for your model from the aggregator site (for example, miui.com) and install it via Recovery or Fastboot mode.

To do the locking, you will need a computer and the Mi Flash Tool. In Fastboot mode, select the Clean all and lock option. Important: never choose the lock option if you have global firmware installed on a Chinese device or vice versa - this will lead to a bootloop (cyclic reboot).

⚠️ Attention: Locking the bootloader on a device with inappropriate regional firmware (e.g., locking Global) ROM It can permanently lock your phone on a Chinese device. Make sure the firmware version matches the region of the device.

If you don't want to reflash your phone, but you need to run a banking app, you can try using the Magisk Hide module (if you get permissions through Magisk), which allows you to hide the presence of Root rights from specific applications, but you can't hide the fact that the bootloader (the open lock itself) is unlocked without physically locking it - the icon will remain, but the applications can work.

Diagnostics of condition through engineering menu and ADB

For those who want to know exactly what causes the icon, you can use more advanced diagnostic methods. Standard phone settings don't always show full security status. One way is to use the ADB (Android Debug Bridge) command line on your computer.

Connect your phone to a PC with USB debugging enabled and enter the following command to check the bootloader status:

adb shell getprop ro.boot.flash.locked

If the command returns 0, the bootloader is unlocked (open lock). If 1 is the bootloader is locked. You can also check for Root rights by trying to run the command with superuser rights:

adb shell su -c "id"

If you get a line with uid=0(root) in response, the superuser rights are active, and if the system responds with an access error or "su not found", then there are no Root rights, and the icon can only be associated with the unlocked bootloader or specific developer settings.

Should I leave my phone with the unlocked bootloader?

The decision to leave your device in an open lock state depends on your goals. For the average user who uses a smartphone for calls, social networks and payments in stores, an unlocked bootloader has no benefits other than potential risks. In today’s digital world, personal data security is more important than the ability to install modified themes or remove system applications.

On the other hand, for enthusiasts, developers, or those who use older Xiaomi models as second test devices, openness gives freedom. Being able to install custom firmware (LineageOS, Pixel Experience) can extend the life of a device that is no longer receiving updates from the manufacturer, but in this case you need to be prepared for the fact that banking applications will not work.

Anyway, if you see an open lock and you don't remember how it got there, you should think about the origin of your device. Buying used phones with an unlocked bootloader is a lottery, and the previous owner could modify the system so that there are holes in it to access data.

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An open lock is an indicator of reduced security. For everyday use, it is recommended to lock the loader and return to stock firmware.

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