Your Xiaomi suddenly becomes a “perpetual alarm clock” that goes on and off all the time? This is one of the most annoying problems for smartphone owners of the brand, but in 90% of cases it can be solved independently. Cyclical reboot (or bootloop) occurs on both old Redmi 4X models and the new POCO F6, and the causes can be hidden in software failures and hardware malfunctions.
In this article, we will look at all possible causes, from commonplace overheating to damaged charging connector, and give step-by-step instructions for diagnosis and repair. Importantly, some methods (such as flashing through the Fastboot) require minimal technical skills, but we will explain them so that even a beginner can understand them, starting with the simplest one: checking the battery and charger.
1. Checking of the battery and charger
The first thing to rule out is power issues. In 35 percent of cases, Xiaomi's cyclical reboot is associated with a faulty battery or power supply, especially if the phone reboots when it connects to a charge.
- 🔌 Change the charger and cable. Use Xiaomi's original power supply (at least 18 watts for modern models). Cheap cables often cause voltage surges.
- 🔋 Check the battery for bloating. Carefully remove the back cover (if it is removable) or inspect the case for deformation. A bloated battery is a direct safety hazard!
- 🌡️ Control the temperature. If the phone is hot to the touch, let it cool for 15 to 20 minutes. Overheating above 45.°C may cause emergency rebuttals.
If you still have a problem after replacing the charge, move on to the next step. Note: on Redmi Note 10 Pro models and later, there is a frequent bug with fast charging - the phone can reboot when connected to powerful blocks (33 W and above).
⚠️ Warning: Never use a phone with a bloated battery! This can cause fire. At the first sign of deformity (the body is "lighting", the screen is raised), immediately turn off the device and contact the service.
2. Resetting settings to factory
If the problem is not power, the next step is a soft reset, which will delete all user data, but return the phone to working condition. SIM-Card and memory card – sometimes they cause conflicts when downloading.
How to make a reset on Xiaomi:
- Turn off your phone (if it still responds to the buttons).
- Press Volume Up + Power before the Mi logo (Recovery Mode) appears.
- Select a language, then go to Wipe Data → Wipe All Data.
- Confirm the action and wait for the completion (5-10 minutes).
Once reset, the phone will turn on as new. If the cyclical reboot stops, the problem was in the software. If not, go to the firmware check.
☑️ Preparation for resetting settings
3. Update or reflash MIUI
Firmware failures are the second most common cause of bootloop on Xiaomi, which can occur after a failed Airborne Update (OTA) or because of a conflict of system modules.
- 🔄 Update. MIUI Download the latest firmware version for your model from the official Xiaomi website, transfer it to your phone (via the phone). OTG or to the root of memory if the phone is sometimes turned on) and install via Recovery → Install update.zip.
- 🖥️ Fastboot, it's more complicated, but it's more efficient, and you'll need a PC with Mi Flash Tool drivers installed and the original cable. USB. Instructions: 1. Download Fastboot firmware for your model. 2. Press Volume down on your phone + Power to log in to Fastboot. 3. Connect to your PC and launch the Mi Flash Tool. 4. Select the firmware file and click "Flash".
Important: When you flash through Fastboot, choose Clean All instead of Save User Data, which will eliminate conflicts with the remnants of the old firmware.
| Firmware method | Difficulty | Time. | Are the data stored? |
|---|---|---|---|
| Update via Recovery | ⭐ | 10-15 minutes | Yeah (unless you do Wipe) |
| Installation via Fastboot | ⭐⭐⭐ | 20-30 minutes | No. |
| EDL-regime (for “bricks") | ⭐⭐⭐⭐ | 40+ mine | No. |
⚠️ Attention: Firmware through EDL (Emergency mode) requires an authorized Xiaomi account and can lock the phone if it is not done correctly.
4. Verification of hardware components
If the software methods didn’t work, the problem is the hardware, and here are the most vulnerable components on Xiaomi that can cause a cyclical reboot:
- 📱 Charging connector. Oxidized or bent contacts lead to short circuits. Check the connector for debris or damage.
- 🔌 Power buttons on Redmi 9 and POCO X3 Often the switch sticks, which the system perceives as a command to the rebuke. Try to move the button carefully, if the phone reacts, it needs to be fixed.
- 🛠️ Memory. eMMC/UF. Wearing flash memory (especially on budget models) can cause failures when reading system files (##4636## → "Testing").
To diagnose hardware problems, it is useful to connect the phone to the PC and check the logs through ADB (if the device is even briefly turned on).
adb logcat | grep -i "reboot\|crash\|error"If errors such as E/AndroidRuntime: FATAL EXCEPTION or kernel panic occur in logs, this indicates critical system failures that are often solved only by replacing the motherboard.
How to enter the engineering menu on Xiaomi?
5. Conflicts with applications and services
Sometimes the culprit for endless reboots is not the system, but a third-party application or service. For example, Xiaomi with MIUI 14 is known for bugs with:
- 🔒 Google Play Services – Service updates may conflict with the shell MIUI.
- 📱 Cache cleaner applications (such as Clean Master) that delete critical system files.
- 🎮 Games with aggressive optimization (such as Genshin Impact or PUBG), processor-overloading.
How to identify the problem application:
- If the phone turns on for even a short time, go to Safe Mode (press the power button → long tap on "Switch off" → "Safe Mode").
- In Safe Mode, remove newly installed apps.
- If the reboots stop, the culprit is found. Delete it completely and check for updates on Google Play.
On the POCO F3 and Redmi K40, frequent reboots can be associated with hyperfrequency CPU mode (Performance Mode in battery settings).
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If your phone reboots when you connect to Wi-Fi, try forgetting the network in your settings or changing the channel on your router (from 2.4 GHz to 5 GHz), sometimes causing conflict with incorrect DHCP settings.
6.Problems with motherboard and soldering components
If all the previous methods didn't work, it could be hardware malfunctions in the motherboard.
- 🔥 Burnt-out power stabilizer (e.g, PMIC Symptoms: the phone only turns on from charging, but immediately turns off.
- 📡 The dump of a memory chip or processor (often after falls) manifests as a cyclic boot with a black screen or Mi logo.
- 💧 Corrosion after moisture is injected. Even if the phone hasn't sunk, condensation inside the case can oxidize the board tracks.
It is difficult to diagnose such problems on your own, but there are indirect signs:
| Symptoms. | Probable cause | Can I fix it? |
|---|---|---|
| The phone is still warmed even when it is off. | Short circuit on board | Yes (component soldering) |
| Resetting when vibrating or pressing the body | Chip dump or board crack | Sometimes (depending on the damage) |
| The Mi logo appears and disappears cyclically. | The bootloader is damaged. | Yeah (flashing through EDL) |
The board requires specialized equipment (sweeping station, microscope) and experience.
- Replacement PMIC — 2,500 ₽
- Re-solding of memory chip - from 5 000 ₽
- Corrosion elimination – from 1,500 ₽
⚠️ Warning: If the phone reboots after falling or getting moisture, don't try to turn it on repeatedly! Each rebut can aggravate the damage.
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Before visiting the service, make a backup copy of the data through ADB Backup (if the phone is turned on for a while) Command: adb backup -apk -obb -shared -all -f backup.ab.
7. When to contact the service center
Not all problems can be solved by yourself. contact the official Xiaomi service or a trusted repair center if:
- 🛠️ The phone does not respond to any button combinations (not included in Recovery or Fastboot).
- 🔥 On the case or board visible traces of burns, swollen capacitors.
- 💦 The phone was in contact with liquid (even if it was dry).
- 📉 Diagnosis through ADB Fastboot shows errors such as device not found or preloader crash.
The cost of diagnostics in official Xiaomi services is usually 500-1000 ₽, But it can save you a lot of money, like if the power controller is the problem, it's cheaper to replace it than it is to buy a new phone.
For warranty models (up to 12 months from the date of purchase), repairs must be free unless the fault is caused by mechanical damage.
If the phone is older than 3 years, consider repairing it.For example, replacing the battery with a Redmi 5 (2017) can cost 1,500. ₽, The phone itself on the secondary market is 3,000. ₽. In this case, it is more logical to consider buying a new model.