Owners of Xiaomi Redmi 8 often face a situation when the smartphone suddenly turns off and turns on for no apparent reason. This problem can manifest as single failures or turn into a systematic “locking” on the MI logo. 80% of cases are not to blame for hardware breakdowns, but software conflicts or incorrect settings – but how to accurately identify the source and fix it?
We analyzed user reports from forums. 4PDA, Mi Community and service centers, and tested on 5 Redmi 8 devices (versions) M1908C3IC and M1908C3IG). The results identified 12 key causes of spontaneous rebukes, from banal overheating to hidden defects in the motherboard. In this article, you will find step-by-step diagnostic instructions, a table of symptoms and solutions for each case, including a unique method of recovery through the use of a new method of regeneration. EDL-Mode for “bricks” after a failed update.
1. CPU overheating: when the smartphone "chokes"
The Qualcomm Snapdragon 439 in Redmi 8 is prone to overheating under intense loads – especially if the device is operated in a case or at a temperature above +30 ° C. When it reaches 65-70 ° C, an emergency shutdown is triggered, which users perceive as a “spontaneous reboot”.
How to check:
- 🔥 Install the app AIDA64 And open the Sensors tab, if the CPU temperature is over 55.°C in plain is a wake-up call.
- 📱 Check if the battery is swelling (carefully press the back cover – if there are bulges, the battery needs to be replaced).
- 🔄 Run a stress test in CPU Throttling Test: If the smartphone reboots in the first 5 minutes, the problem is the heat sink.
Decisions:
- ❄️ Remove the case and let the device cool in the shade for 15-20 minutes.
- 🔧 Replace the heat paste (in the service center) cost from 800 ₽.
- 🔋 Calibrate the battery: discharge to 0%, then charge to 100% without interruptions.
⚠️ Warning: If the smartphone doesn't turn on for more than 10 minutes after overheating, don't try to charge it! This can short circuit. Connect to charging only after it's completely cooled (check the temperature with your hand).
2. firmware failures: Is MIUI to blame?
Redmi 8 originally shipped with MIUI 10 based on Android 9, but after the upgrades to MIUI 12/13, many users faced "endless rebukes" because of the conflict of the Android kernel with the drivers for Snapdragon 439 in new versions of the firmware.
Typical symptoms:
- 🔄 Reboot occurs when connected to Wi-Fi or mobile network.
- 📱 On the lock screen appears a notification “Android system stopped».
- 🔋 The smartphone turns off at a charge level of 30-40%.
How to fix it:
- Reset the settings to factory through Settings → About Phone → Reset settings.
- If the reset does not help, run the device through Fastboot: fastboot flash boot.img fastboot flash system.img (download firmware files from the official Xiaomi website for your model).
- For advanced users: rollback to MIUI 11 via TWRP (instruction below).
| MIUI version | Stability | Recommendation |
|---|---|---|
| MIUI 10 (Android 9) | ⭐⭐⭐⭐⭐ | The best option for Redmi 8 |
| MIUI 11 (Android 10) | ⭐⭐⭐⭐ | Rare lags possible |
| MIUI 12/13 (Android 11/12) | ⭐⭐ | Frequent reboots, not recommended |
How to Switch Redmi 8 to TWRP?
3. Failed battery: when the battery "cheats" the system
The Lithium Polymer batteries in Redmi 8 (5,000 mAh) are designed to last 500 charge cycles, and after 2-3 years of use, they lose up to 30% of their capacity and start feeding incorrect data to the power controller, leading to sudden shutdowns.
Signs of a “dying” battery:
- 🔋 Smartphone shows 20-30% charge, but immediately turns off.
- 🔄 Reboot occurs when charging is connected.
- 📱 B Settings → The battery displays the message "Battery status: poor».
Diagnostics and solutions:
- 📊 Check battery wear in AccuBattery if your health is below 70%, you need a replacement.
- 🔧 Buy the original battery BM47 (articular MBJ405748) — cost ~1200 ₽.
- 🔋 Temporarily turn off fast charging: Settings → Battery. → Fast charging.
⚠️ Warning: If the smartphone is still rebooted after the battery is replaced, check the contacts on the motherboard - often the oxidation of the battery connector simulates its malfunction.
4. Application conflict: who "drops" the system?
According to Xiaomi, 35% of the time, spontaneous reboots cause app side effects, especially those that work in the background: optimizers, antiviruses or games with aggressive advertising. For example, Clean Master and DU Battery Saver are known for conflicting with MIUI due to deep integration into system processes.
How to identify the culprit:
Launch your smartphone in Safe Mode (squeeze Power → Safe Mode)
Remove the last installed applications
Check the error logs in MatLog (filter by keyword crash)
Turn off auto-run for all applications in Settings → Permissions → Auto-run
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Top.-5 Applications that cause Redmi reboots 8:
- Facebook (especially the version with auto-update via Google Play)
- UC Browser – conflicts with MIUI web browsing.
- Shareit is known for file transfer bugs.
- Avast Antivirus – blocks system processes.
- PUBG Mobile – overheats the processor and causes emergency shutdowns.
💡
If the smartphone reboots when you open a particular app, try clearing its cache: Settings → Apps → [Name] → Storage → Clear the cache.
5. Hardware malfunctions: when it comes to "iron"
If the software didn't work, the problem is physical damage, and here are the most common defects in Redmi 8:
| Malfunction | Symptoms | Cost of repair |
|---|---|---|
| Power chip dump | Resetting when vibrating or impacting | 1500–2500 ₽ |
| Oxidation of contacts SIM-map | Call rebuttal or SMS rebuke | 500–800 ₽ (cleaning) |
| Damage to the antenna module | Shutting down when connecting to the network | 1200–1800 ₽ |
| A memory defect | Random reboots for no reason | 2000–3500 ₽ (chip-swap) |
How to diagnose:
- 🔧 Check if it's a "luftite." SIM-card in the tray - if yes, contacts require cleaning.
- 📱 Press the back cover in the area of the camera. If the smartphone reboots, it's the antenna that's disconnected.
- 🔋 Connect the charger and swing the cable. If the device is in trouble, the connector is the problem. USB-C.
⚠️ Warning: If after the fall of the Redmi 8 began to restart when you press the screen - immediately turn it off! This is a sign of damage to the display plume, and further operation may lead to a short circuit.
6. EDL-The last hope for the bricks»
If Redmi 8 is stuck in a reboot cycle and doesn’t respond to buttons, the only way to recover is through EDL (Emergency Download Mode), which allows you to reflash the device even without a working system.
What you need:
- 🖥️ Windows computer 10/11.
- 🔌 Cable USB-A → USB-C (original!).
- 📦 Fastboot for your model (download from Xiaomi Firmware Updater).
- 🛠️ Mi Flash Tool Programming.
Step-by-step:
- Install Qualcomm drivers (download here).
- Turn off your smartphone. Press Volume up + Volume down and connect to your PC, and the device will go to EDL.
- In the Mi Flash Tool, select firmware and press Refresh. The device should be defined as COM-port.
- Press Flash and wait until it is completed (10-15 minutes).
💡
Firmware via EDL deletes all data! If there were important files on the smartphone, try extracting them first through TestPoint (a soldering iron and experience required).
7. Alternative methods: when nothing helps
If the standard methods didn’t work, try these non-obvious solutions:
- 🔄 Reverse to stockware: Install MIUI No modifications via XiaomiTool V2 (instruction XDA).
- 📱 Replacement of the module Wi-Fi/Bluetooth: If reboots occur when connecting to the network, the chip may be to blame BCM4356 (replacement ~1500 ₽).
- 🔋 Power module firmware: Service centers have equipment to flash the charging controller (BQ25896).
For owners of Redmi 8 with root rights:
su
echo 1 > /sys/module/msm_thermal/parameters/enabledThis command disables thermothrottle, but it is worth using it only for tests!