Owning a Xiaomi smartphone is often the first step into the world of deep customization of Android, but users are quickly faced with the strict limitations of the manufacturer. The main obstacle to obtaining root rights and installing third-party firmware is a blocked bootloader known as Bootloader. Many beginners mistakenly believe that you can just flash a modified recovery menu, bypassing official unlock procedures, but the security architecture of MIUI and HyperOS is much more complex.
Trying to install TWRP or OrangeFox on a device with an active bootlock is not only doomed to failure, but can lead to irreversible consequences for the software of the gadget. The signature verification system at the Linux kernel level checks the integrity of each downloaded component, and if changes are detected, it simply refuses to start the system or returns the stock state.
In this article, we will take a closer look at the technical aspects of locking, explain why direct installation is impossible, and offer the only correct algorithm for modern models. You will learn about the risks associated with attempts to bypass protection, and get a clear idea of what Anti-Rollback is - a mechanism that can turn a phone into a brick when you do not act correctly. Preparing for major changes requires a full understanding of all stages of the process.
Principles of work of the Xiaomi bootloader and system lock
The bootloader, or Bootloader, is a small program that runs to the operating system and checks the integrity of all its components. Xiaomi devices have Locked mode activated by default, which means that you can't run any code that isn't signed by the manufacturer's digital keys. It's a fundamental security element designed to protect user data from malware and information theft.
When you try to send a command to install a custom recavator through Fastboot, the device checks the digital signature of the image against a database of trusted keys. If the signature is missing or does not match (which is always true for TWRP), the process is interrupted at the hardware level. Even if you miraculously manage to write the file to the recovery section, the next time you restart, the system either does not start or automatically restores the original image from the protected memory area.
⚠️ Note: Attempts to use exploits for temporary unlock (temporary unlock) on Snapdragon and MediaTek processors of recent years of release in 99% of cases lead to a cyclic restart (bootloop) or complete loss of the ability to turn on the device.
There is a misconception that the presence of USB-But the debugging allows you to bypass these limitations. ADB limited to the user level and do not allow interaction with low-level partitions where the bootloader resides. Without unblocking through official Xiaomi servers, any commands to modify system partitions will be ignored or cause a execution error.
- 🔒 Verified Boot is a technology that checks system integrity at each start and blocks booting when changes occur.
- 📡 Mi Unlock Tool is the only official software that can send a request to the server and unlock the bootloader.
- 💾 Recovery Partition – a memory partition protected from recording without superuser rights or unlocked BL.
- 🚫 Fastboot Mode – a mode in which commands are received, but their execution depends on the blocking status.
Why TWRP cannot be installed without unlocking
The technical impossibility of installing TWRP on a locked phone is due to the Android security architecture, which has been significantly enhanced in recent versions of the operating system. The section that records the image of the recovery has read-only attributes for all processes running inside the operating system. ADB teams do not have sufficient privileges to rewrite this partition without first removing restrictions.
Even if you assume that it's theoretically possible to write a file, dm-verity and Android Verified Boot (AVB) won't allow the phone to boot into a modified environment. When you start the device, the hash of the recovery partition is compared to the reference value stored in the protected area. The mismatch causes a security reaction: the device either refuses to boot or will force the stock image to ignore your changes.
In addition, modern processors use the TrustZone security layer, which isolates critical operations from the main core of the system, and an attempt to interfere with this process from the outside is considered an attack, so the question of how to install custom receptacles on a locked phone has the right answer: first you need to officially unlock the bootloader, having received permission from the manufacturer.
What is Anti-Rollback?
Official method of unlocking the loader
The only safe and workable way to prepare a device for custom software installation is to officially unlock through the Mi Unlock Tool, a process that requires you to link your Mi Account to your device and wait for a certain period of time, which is usually 7 to 15 days (sometimes longer), despite the seeming bureaucracy, this mechanism ensures that the user is aware of their actions and risks.
To start the procedure, you need to go to the phone settings, find the item "For developers" and activate the status of the device and OEM-Unlock. You then have to link your account to the bootloader status menu, and only after the standby timer has expired can you connect your Fastboot phone to your computer and start unlocking through your PC, and that will delete all the data from the device, so back up in advance.
☑️ Checklist before unlocking
It is important to understand that once unlocked, some security features will be cut: the default banking applications will stop working (an additional patch is required), the possibility of using Widevine L1 (low-quality movies in streaming) will disappear, and the quality of shooting may decrease due to changes in image processing algorithms.
Instructions for installing custom recavery
After successfully completing the unlocking procedure and the Unlocked label appears when you turn on your phone, you can start installing TWRP. The first step is to find the correct version of the recovery for your model. Using the image for another device is guaranteed to lead to breakdown, since the memory address and screen drivers of different Xiaomi models differ.
The downloaded file with the.img extension must be placed in the folder with the ADB tools on the computer. The phone is converted to Fastboot mode (clamping the volume button when you connect the cable). Then the firmware command is executed through the command line. It is important not to allow the system to restart until the installation is completed, since the stock firmware can automatically wipe the modified recovery partition.
fastboot flash recovery twrp-3.x.x-x-.img
fastboot boot twrp-3.x.x-x-.imgThe second command in the above block (fastboot boot) is a temporary boot, which allows you to check the performance of the recovery without flash recording. If the TWRP menu started correctly, you can make a permanent installation or immediately flash a patch to save rights after rebooting. For models with dynamic partitions (A/B), the procedure may be different and require firmware to be installed in both slots at once.
💡
Use the original. USB-cable and connect the device directly to the motherboard port (back of the PC), rather than via hubs or front panels of the case, to avoid communication breakdown at a critical moment.
Comparison of installation methods and risks
When choosing a device modification method, it is important to weigh the pros and cons. Below is a table comparing the state of the device before and after unlocking, so you can make an informed decision. Remember that any action you take is at your own risk.
| Parameter | Blocked BL (Stock) | Unlocked BL (Custom) |
|---|---|---|
| Security of data | High (Encryption, Verified Boot) | Medium (risk of physical access) |
| Work of banking applications | It's working by default. | Requires concealment of root rights (Magisk/KernelSU) |
| Possibility of installing TWRP | Impossible. | Possibly (full access) |
| Photo quality (Widevine) | HD / 4K (L1) | SD (L3) on many models |
| Guarantee | Preserves (formally) | It may be lost when dealing with the |
The main risk when working with an unlocked bootloader is the human factor: an error in choosing a firmware file, interrupting a cable during recording, or trying to sew an incompatible module can lead to software damage. Unlike a locked state, where the phone protects itself, an unlocked device will execute any command, even destructive ones.
However, for enthusiasts, the benefits outweigh the risks: the ability to do full partition backups, clean system debris at a deep level, change the kernel and install current versions of Android on older devices is worth it.
💡
Unlocking the bootloader is an irreversible action in the context of warranty and security, opening full access to the system, but requiring high technical literacy.
Possible problems and solutions
During the modification process, users often encounter an error called FAILED (remote: device is locked).This means that the command is sent correctly, but the bootloader is still locked.There is no solution for this situation except to go through the official unlock procedure. Any programs promising to "remove the lock in 5 minutes without waiting" are most likely fraudulent or contain viruses.
Another common problem is a “boot” after installing a recover, which often happens if the TWRP version does not match the Android version or partition type (A/B vs A-only), in which case you need to go to Fastboot mode and flash the stock image of the recovery command fastboot flash recovery.img from the firmware, after which the phone will again boot in normal mode.
⚠️ Warning: If after a failed firmware, the phone stopped responding to buttons and the computer does not emit a connection sound USB, Possibly damaged loader (PBL). In this case, only soldering of memory or the use of a programmer will help, which requires contacting a service center.
Also worth mentioning is the problem with data encryption. Once you first install customized backups on Android 10 and above devices, you may need to format the data partition (TWRP Format Data command) so that the backups can read internal memory. Without this step, you will only see the system files, but not your photos or documents. This is the standard security behavior.