Why Xiaomi Redmi 8 is constantly rebooting and how to fix it

Xiaomi Redmi 8 is one of the brand’s most popular budget smartphones, but even it’s not immune to system failures. If your device starts spontaneously rebooting, it’s not only annoying, but can signal serious problems, from software bugs to hardware failure. In 80% of cases, the problem can be solved on its own without resorting to the services of a service center.

In this article, we will look at all the possible causes of Redmi 8 cyclical reboots, from trivial overheating to motherboard damage, and give you step-by-step instructions with illustrations, checklists, and risk warnings, and focus on diagnostics: how to tell hardware from software failure, when you should try to repair your phone on your own, and when you should take it to the workshop.

Important: if the reboot began after a fall, moisture or self-disassembly, immediately go to the section about hardware malfunctions - software methods will not help here.

1.The main reasons for the constant reboots of Redmi 8

Cyclic rebukes rarely occur out of the blue, most often triggered by:

• 🔥 Overheating of the processor - especially when playing or charging. Redmi 8 is equipped with Snapdragon 439, which is prone to trottling at high loads.
• 📱 Firmware failures - after a failed update MIUI Often accompanied by hanging on the Xiaomi logo.
• 🔋 Failed battery – bloating, loss of capacity or short circuit in the battery leads to sudden shutdowns.
• 🛠️ Damage to the motherboard – after impacts, falls or oxidation of contacts (for example, from moisture).
• 🧹 Clogging connectors - dust in the slot SIM-card USB-The port can cause false alarms of sensors.

According to service center statistics, 60 percent of the time is firmware, 25 percent is battery, and 15 percent is hardware damage, which means you're very likely to get through without repair.

2.Diagnosis: How to determine the cause of reboots

Before you start repairing, you need to identify the source of the problem.

1. Check the temperature of the case. If the phone is hot (above 45)°C is most likely to blame for overheating. Use the app AIDA64 processor temperature monitoring.
2. Turn off the charging and see if the reboots are continuing. If not, the problem is in the power supply or the cable.
3. Launch your phone in Safe Mode (hold the power button) → long tap on "Switch off" → "Restart in Safe Mode. If the reboots have stopped, it is the third-party app’s fault.
4. See the error log through Settings → The phone. → Version. MIUI (tap 5 times on "Kernel Version"). In the menu that appears, select MiLog and find the records with the reboot tag.

⚠️ Note: If the phone is rebooted every time 1-2 You can't even log in to the settings, which is a sign of critical firmware damage. Don't waste your time on half measures, just go to the Fastboot Firmware section.

3. Software methods to eliminate reboots

Start with the simplest and safest methods, and in most cases, even a simple cache cleaning helps.

Remove unused applications|Clear the cache in Settings → Warehouse|Turn off automatic application updates|Check the space available (at least 2 GB required)-->

Reset to factory settings

It's a universal solution for 40 percent of software failures, and it's important that you save your data before you reset, because it's going to be deleted.

1. Go to Settings → About the phone → Reset settings.
2. Select Reset All Settings (not to be confused with Network Resettings!).
3. Confirm the action and wait for the reboot (can take up to 10 minutes).

If the phone doesn’t turn on or resets during the process, use Hard Reset:

1. Turn off the machine.
2. Press Volume Up + Power for 10 seconds.
3. In the Recovery menu, select Wipe Data (manage volume buttons, confirmation – power button).

Update or rollback of firmware

If the reboot started after the update MIUI, Try to revert to the previous version:

1. Download stable firmware for Redmi 8 from the official Xiaomi website (choose Global or Russia region).
2. Rename the file to update.zip and place it in the root of the phone’s memory.
3. Go to Settings. → The phone. → Updating the system → press three points → Select a firmware file.

⚠️ Warning: Do not install firmware for other models (e.g. Redmi Note 8) - this will lead to a blink (completely inoperable) of the phone. Check the file name: must contain olive (codename Redmi 8).

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If the phone doesn't see the file update.zip, Try using a different file manager (for example, FX File Explorer) or copy the firmware to SD-map.

Removal of problematic applications

Some programs (especially optimizers, antiviruses, or root-right games) may conflict with the MIUI. To find out:

1. Download to Safe Mode (see Diagnostics section).
2. If the reboots stopped, it is the fault of third-party software.
3. Remove newly installed apps, starting with the most suspicious ones.

Top.-5 Applications that frequently cause rebukes on Redmi 8:

• 🛡️ Antivirus: Avast, 360 Security, Clean Master
• 🎮 Games: PUBG Mobile, Free Fire, Call of Duty (Due to Overheating)
• 🔧 Optimizers: DU Speed Booster, CCleaner
• 📱 Launchers: Nova Launcher, Microsoft Launcher (conflict with the MIUI)
• 🔄 Magisk modules: any modifications to the kernel (e.g, ViPER4Android)

4. Hardware malfunctions: when without repairs can not do

If the software methods didn't work, the problem is the hardware, and let's look at the typical hardware causes and how to fix them.

Diagnostics of the battery

The Redmi 8 has a 5,000 mAh battery, but it degrades over time.

• 🔋 The phone turns off when 20-30% charge.
• 🔌 Reboots when charging is connected.
• 🌡️ The body is swelling (check if the phone is on the table).

How to check the status of the battery:

1. Install the AccuBattery app.
2. Charge your phone to 100% and see the actual capacity (if less than 3500 mAh – the battery is worn out).
3. Check the battery health in the Charging section.

⚠️ Warning: If the battery is swelling, turn off the phone immediately and do not use it until the battery is replaced!

Problems with the motherboard

If the phone reboots even with the battery turned off (when connected to the charger), the motherboard is to blame.

• 💧 Short circuit after moisture hits (even if the phone hasn't sunk, high humidity is enough).
• ⚡ Static electricity in the careless disassembly.
• 🔨 Mechanical damage (cracks on the board after falling).

Self-repairing the board requires a soldering station, a microscope and experience. Without skills, you risk making the problem worse.

Processor overheating

The Snapdragon 439 in Redmi 8 isn't the most productive chipset, and at high loads it warms up quickly.

• 🟢 40.°C - optimal.
• 🟡 40-50°C - permissible in games.
• 🔴 Above 50.°C - critical overheating.

How to lower the temperature:

• 🧊 Clean your phone of dust (use a can of compressed air for connectors).
• 🔄 Turn off the background activity of applications in Settings → Battery → Energy saving regime.
• 🎮 Reduce the graphics in the games (select Low quality in the game settings).
• 🛡️ Set a limit FPS (For example, through the Game Turbo in the MIUI).

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If the phone overheats even in a simple (for example, when watching a video), it is a sign of drying thermopaste. ₽.

5. Flash-through via Fastboot (last chance)

If the phone doesn't turn on or it's stuck on the logo, you just have to flash it over the Fastboot, which is a radical method that will bring the phone back to life in 90 percent of software failures.

What you need:

• 🖥️ Windows computer 7/10/11.
• 🔌 Original. USB-cable (better from the set).
• 📁 Fastboot for Redmi 8 (codenamed olive).
• 🛠️ The Mi Flash Tool.

Step-by-step:

1. Download Fastboot firmware for Redmi 8 (select the Stable version).
2. Unpack the archive in the folder C:\MiFlash.
3. Install the Mi Flash Tool and Qualcomm drivers.
4. Turn off the phone and press Volume Down + Power to log in to Fastboot.
5. Connect your phone to your PC and start MiFlash.exe.
6. In the program, click Select, specify the path to the folder with the firmware, then Refresh (should appear). COM-port).
7. Choose Clean all and press Flash. It'll take a while. 5-10 minute.

fastboot devices // Check the connection


Fastboot flash all // Firmware command (if Mi Flash didn't work)




fastboot reboot // Reboot after firmware

⚠️ Note: If an anti-rollback error appears during firmware, it means you are trying to install an older version. MIUI, In this case, you need to download the firmware of the new version or reset the anti-rollback through the EDL-Mode (requires an authorized Xiaomi account).

6 If nothing has worked: what to do next

You've tried all the methods, but Redmi 8 is still rebooting? Maybe the problem is bigger than it seemed. Let's take a look at the extremes.

Verification of the guarantee

If you bought your phone less than a year ago, check the warranty:

1. Go to the Xiaomi Verify website.
2. Enter the IMEI (indicated on the box or under the battery).
3. If the warranty is valid, contact an authorized service center.

The following are the warranty cases for Redmi 8:

• ✅ Battery defect (blown, rapid discharge).
• ✅ Malfunction of the motherboard (if there are no traces of an autopsy).
• ✅ Display problems (artifacts, broken touchscreen).

Non-guarantee cases:

• ❌ Moisture intake (there are oxidation indicators).
• ❌ Mechanical damage (cracks on the body or screen).
• ❌ Self-flashing or rooting.

6.2. Alternatives

If repairs are more expensive than the phone, consider:

• 📱 Purchase of used motherboard (on AliExpress or Avito – about 3000-5000) ₽).
• 🔧 Self-replacement of components (if you have experience soldering).
• ♻️ Trade-in – many stores accept faulty phones at a discount on new.

Average price of Redmi 8 on the secondary market (2026):

• 🟢 Worker (both) – 4,000–6,000 ₽.
• 🟡 Spare parts (not included) – 1,500–2,500 ₽.
• 🔴 Broken (Screen/Custom Broken) 500–1,000 ₽.

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If you decide to sell a defective Redmi 8, honestly state in the ad all the defects. aftermarket buyers often check phones through ##4636## (test menu), and the cheating will quickly be revealed.

FAQ: Frequent questions about Redmi reboots 8