When your Xiaomi, Redmi or POCO smartphone suddenly starts to live its life, it can take you by surprise: the screen lights up, the MIUI or HyperOS logo appears, the device vibrates, but immediately goes out to start the cycle anew in an instant. This phenomenon, known as a “bootloop” or cyclical reboot, often scares users, but does not always mean a fatal breakdown.
Most cases are caused by software failure, application conflict, or battery discharge that no longer holds peak loads, but more serious problems can not be ruled out, such as overheating of the processor or the departure of the contacts of the plumes. Understanding the nature of the problem is the first step to saving the gadget without going to the service center.
Below we will go into all possible scenarios, from simple software solutions to complex hardware interventions, and it is important to act consistently to avoid aggravating the situation and save important data.
⚠️ Warning: If the device is very hot or has a swollen battery, immediately stop attempts to charge and operate.
The main program causes of instability
The most common problem is the software part of the operating system. Android operating system in conjunction with the MIUI shell can encounter a critical error that causes an emergency restart, this occurs when system processes cannot process requests correctly or when key configuration files are damaged.
One common cause is a failed system update: If a power surge or network failure occurs during the boot or installation of security patches, the system partition can be damaged, causing the phone to try to run corrupted files, encounter an error, and go into reboot.
Third-party conflict can also be the culprit: Installed software, especially from unverified sources, can inject malicious code into the system or create incompatible libraries, causing a “resource conflict” that device drivers cannot resolve using standard methods.
- 📱 Damage to system files after resetting or updating firmware.
- 📱 Conflict of newly installed applications with Google system services.
- 📱 Cache overflow that does not have time to clean automatically.
- 📱 Error in Recovery Mode or bootloader.
It's important to note that software failures can often be fixed without losing data completely if you can get into recovery mode, but if the phone turns off too quickly, the window of opportunity narrows.
Problems with battery and power system
The hardware that runs the power supply often fails before other components. Lithium-ion batteries have a limited life cycle of charging and discharging. As the battery ages, its internal resistance increases, and it ceases to provide the necessary current at peak load times, such as when the system starts.
When the phone is turned on, it consumes maximum current. If the battery is worn out, the voltage at its terminals drops sharply below the critical threshold, and the power controller forcibly turns off the device for protection, visually it looks like an instantaneous shutdown after the logo appears.
Besides natural wear, contact oxidation can cause problems, and moisture or just long life can cause the battery connector to become coated with an oxide film, which disrupts current transmission, causing unstable operation.
☑️ Diagnostics of the battery
Sometimes the problem isn't with the battery itself, but with the charge controller on the motherboard, and if that component is damaged, the phone may not correctly detect the charge level or refuse to charge at all, going into an endless cycle of launch attempts.
⚠️ Warning: Do not use damaged or swollen batteries. Attempting to charge such a battery may cause a fire or explosion.
Failures after firmware update or flashing
If Xiaomi’s phone starts to shut down immediately after the update, there is a high probability of version incompatibility, and switching from global to Chinese (or vice versa) without first unlocking the bootloader and completely cleaning the data often leads to software conflicts.
When you flash through Fastboot or Recovery, partition writing errors can occur, and if the boot or system partition is not written correctly, the operating system will not be able to initialize the hardware, in which case the phone will go to the bootloop.
Trying to install firmware that is not designed for your region (e.g. Global on a CN device) can cause problems with the modem and radio module, which will lead to constant reboots in network search.
fastboot flash boot boot.img
fastboot flash system system.img
fastboot rebootTo solve the problem, you often need to completely reset through Recovery mode or flash the device using the Mi Flash Tool utility in Clear All mode. This will delete all data, but return the functionality.
Risks of flashing
Hardware malfunctions of the motherboard
When software methods are powerless, you have to diagnose hardware. One of the most common causes of cyclic reboots on older models is a CPU or memory dump, which is caused by constant heating and cooling, which leads to microcracks in the soldering under the chip.
The culprit may also be a short circuit in the power supply chain, where if the circuit board has a burnt capacitor or a broken diode, the device will go into protection when the power is supplied, and the diagnosis of such malfunctions requires special equipment, such as a laboratory power supply.
Mechanical damage, such as a fall or impact, can cause plumes to detach or cracks in the board's texture. Even if the phone is intact, the internal structure could be disrupted, causing periodic circuits.
| Symptoms. | Probable cause | Method of decision | Difficulty |
|---|---|---|---|
| The phone is warming up in the off state | CZ in the food chain | Replacement of the power controller | Tall. |
| Vibration's on, screen black. | Display plume dump | Reconnecting the plume | Medium |
| Reboot when the camera starts | Lack of current / wear of the battery | Battery replacement | Low. |
| The Endless MI Logo | Firmware failure/memory | Flashing/rebolling | Medium |
Diagnosing hardware problems at home is limited, and if you don't have the skills to work with soldering equipment and multimeters, you'd better trust the professionals.
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Try to push the CPU area (usually the top of the phone) slightly while you turn on, and if the phone starts, it's probably a problem with the chip dump, and you need to warm up or rebolt the service.
The influence of the power button and external factors
And don't discount the mechanical power button, because over time, the button accumulates dust, pile, or oxidizes the contact group, and this can lead to a button sticking, which causes the phone to constantly be signaled to turn off or reboot.
You can check this carefully by pressing a button a few times quickly or tapping the body slightly in the area of the key, and if the nature of the cyclic switching on changes, the problem is likely to be the mechanics of the button.
External factors, such as extremely low or high temperature, also affect the operation of electronics. -10°C lithium batteries lose capacity dramatically, and the phone can shut down even when it's fully charged. +45°C.
- 🔘 Sticking the mechanism of the power button due to dirt.
- 🔘 Oxidation of button contacts after moisture hits.
- 🔘 Short circuit of the side keyboard plume.
- 🔘 Mechanical damage after falling.
Sometimes it helps to temporarily shut down the power button plume (if the design allows) to eliminate its impact on the start of the system, but on modern monoblock smartphones, this is difficult to do without complete disassembly.
Methods of recovery and resetting settings
If you've determined that the problem is software, restore the device. The first step is to enter Recovery mode. For most Xiaomi models, you need to press the volume button and the power button at the same time.
From the recovery menu, select Wipe Data or Clear Data. This action will delete all user data, but often eliminates conflicts causing the reset. If the normal recovery mode does not help, Fastboot mode (clamping the volume and power button).
In Fastboot mode, you can connect your phone to your computer and use the Mi Flash Tool to cleanly install your firmware, the most reliable way to programmatically bring your device back to factory status.
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A full reset via Recovery (Wipe Data) eliminates 80% of the software causes of a cyclical reboot, but requires a backup of the data.
⚠️ Note: Before performing a Wipe Data reset, make sure you remember the password from your Google and Mi Account account, otherwise your phone may be blocked after a reset.