Why Xiaomi Redmi Note 8 Pro turns on and off on its own – a complete repair guide

Xiaomi Redmi Note 8 Pro is one of the most popular devices of the brand, but even it is not immune to hardware and software failures.Spontaneous on and off (so-called bootloop) is a frequent complaint of users, which can occur both due to banal overheating and because of serious malfunctions of the motherboard. If your phone is stuck in a cycle of reboots, do not rush to carry it to the service: in 70% of cases, the problem can be solved by yourself.

In this article, we will look at all possible causes, from a dead battery to damaged chips, as well as give step-by-step instructions for diagnosis and repair. G90T Or the degradation of the power controller, and if you're not sure about your own abilities, at the end of this article, there's a checklist for choosing a service center.

Before you start repairing, answer the question:

📊 How often does a spontaneous shutdown occur?

Every 5-10 minutes.

Through 1-2 hour

Only when charging.

After the fall/hit

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1.Diagnostics problem: why the Redmi Note 8 Pro goes into a reboot cycle

The first thing you need to do is to determine the nature of the failure, and spontaneous reboots can be divided into 3 types:

🔄 Cyclical Bootloop – The phone turns on, shows the Redmi logo, turns off and repeats the cycle, most often associated with firmware damage or hardware malfunctions.
🔋 Turning off when charging is connected - the device shuts down immediately after the cable is connected.
🌡️ Overheated reboot: The phone turns off when you're loaded (playing games, shooting videos) and turns on when you're cooled.

For an accurate diagnosis, try the following steps:

Connect your phone to charge and watch the indicator, and if it flashes red and goes out, there's a problem with the battery or the power chain.
Try to turn on the device in Fastboot mode (clip the power supply). + Volume down. If you can, it's software failure, if you can't, it's hardware failure.
Light a flashlight on the screen while you "hang" on the logo. If the image is barely noticeable, the backlight or the display plume is faulty.

Critical: If the phone turns off exactly 30 seconds after turning on, it's a sign of short circuit protection on the motherboard, in which case self-repair is dangerous!

How to check the temperature of the processor without special programs?

If the phone is at least on 1-2 Just a minute, just launch the camera and point it at the wall. 10-15 So in seconds, the image starts to ripple, or artifacts appear, and the processor gets overheated, and that's an indirect sign of a problem with the heatpaste or cooling system.

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2. Program causes: from firmware failure to viruses

In 40 percent of cases, the culprit for spontaneous reboots is corrupted software.

📱 Failed update MIUI — Especially relevant for firmware based on Android 10/11.
🦠 Viral software that replaces system files (often disguised as “battery optimizers").
🔧 Conflict after obtaining root rights or installing custom recaveri (TWRP).

How to fix it:

Reset to factory settings (if the phone is turned on for at least 5 minutes): Settings → The phone. → Resetting settings → Delete all data ⚠️ Warning: If the phone turns off during reset, use Hard Reset via Recovery Mode (clip the power) + Loudness up).
Fastboot Flashing (if the reset didn’t help): Download the official firmware for the Redmi Note 8 Pro (codename begonia) from Xiaomi’s website. Use the Mi Flash Tool utility (instruction below).

Method	Difficulty	Time.	Efficiency
Reset via menu	⭐	5-10 minutes	60%
Hard Reset (Recovery)	⭐⭐	15 minutes	70%
Fastboot reflashing	⭐⭐⭐	30-40 minutes.	85%
Removal of viruses through ADB	⭐⭐⭐⭐	20 minutes	50%

Download firmware for begonia|Install the Mi Flash Tool|Disable the antivirus|Charge your phone at least 50 times%|Prepare. USB-cable (original)

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Hardware malfunctions: from battery to motherboard

If the software methods didn't help, the problem lies in the hardware.The Redmi Note 8 Pro has several typical hardware weaknesses:

🔋 Bloated battery - physically presses the motherboard, causing short circuits. Check: if the back of the phone is raised, the battery needs to be replaced.
🔌 Faulty charging connector – oxidized contacts or chain break lead to voltage surges.
🖥️ Damaged power controller (microchip) PMIC) — frequent problem after falls or moisture.
🧊 The dump of the northern bridge - microcracks on the motherboard due to overheating (typical for devices older than 2 years).

Diagnosis without disassembly:

Try to turn on the phone without SIM-If it's working, the problem is the slot contacts.
Connect a charger that is known to be in good working order, and if the phone only turns on from the original cable, the controller is defective.
Light a flashlight on the motherboard (seen through the slits of the case), if there are dark spots, it's oxidation.

⚠️ Warning: If the phone only turns on when the charger is connected, but immediately turns off after disconnection, this is a sign of complete wear of the battery or a break in the power chain, it is dangerous to operate such a device: it can suddenly turn off even at 30% charge.

💡

Before replacing the battery, check its voltage with a multimeter. Norm for the Redmi Note 8 Pro - 3.7–4.2V. If the figure is lower 3.4V, battery to be disposed of.

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4. Step-by-step instruction: flashing through Fastboot

If the phone is turned on in Fastboot mode but does not load further, flashing will help, which restores system files without affecting user data (unless you choose clean all).

What you need:

💻 Windows computer 7/10/11 (on Mac/Linux Possible problems with drivers).
🔌 Original. USB-cable (a faulty cable may interrupt the firmware).
📁 Begonia firmware (download the latest stable version) MIUI).
🛠️ Mi Flash Tool (version 2020 or later).

Instructions:

Install Qualcomm drivers (even if you have Mediatek, you need them for Mi Flash).
Unpack the firmware in a folder without Cyrillic characters (for example, C:\ROM\begonia).
Launch the Mi Flash Tool, press Select and specify the path to the firmware folder.
Connect the phone off to the PC by clamping Volume down + Food (Fastboot should appear).
In Mi Flash, select Clean All mode or Save User Data mode.
Press Flash and wait until it's over (10-15 Don't turn off the cable!

If the process is 99% longer than 5 minutes:

Check the cable and port USB.
Try another mode in Mi Flash (clean all and lock).
Make sure that the antivirus does not block the utility.

💡

If you turn on the phone after you've firmware, but it hangs on the logo, repeat the clean all process, which will delete all the data, but it will restore the functionality.

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5. Repair with your own hands: what can be done without a soldering iron

Not all faults require professional repairs, but here are 3 problems you can fix yourself:

🔧 1. Battery replacement

Symptoms: The phone turns off when 20-30% charge, swollen back cover, overheating during charging.

Tools: plastic spatula, glue B-7000, new battery (original) BM47 analogue ATL).

Step-by-step:

Heat the back cover with a hair dryer (60-70°C) and shovel it.
Turn off the battery plume (don’t pull the wires!).
Remove the old battery, clean the place of glue residues with alcohol.
Stick a new battery and collect the phone.

🔌 2. Cleaning the charging connector

Symptoms: the phone turns on / off when the cable moves, charging is intermittent.

Solution: Clean the connector USB-C toothpick dipped in isopropyl alcohol.Do not use metal objects!

🌡️ 3. Thermopaste replacement

Symptoms: reboots under load (games, shooting) 4K), processor is heated above 80°C.

Tools: Thermopaste Arctic MX-4, plastic card, alcohol.

Warning: Disassembling the Redmi Note 8 Pro requires care – the display plumes and cameras are fragile!

⚠️ Warning: If after battery replacement the phone doesn't turn on at all, check the polarity of the plume connection "+" and the "-" can burn the power controller.

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6. When to contact the service: prices and risks

If none of these methods worked, the problem is bigger than it seemed, and here are the signals that it's time to take the phone to the workshop.

💥 The phone does not respond to any buttons (no vibration, no lights).
🔥 There is a smell of burning or traces of melting on the board are visible.
📉 After the firmware appears error Invalid IMEI Baseband Unknown.
🔧 The charging connector staggers or contacts fall off.

Cost of repair in the service (2026):

Service	Price (₽)	Term	Guarantee
Diagnostics	500–1000	30 minutes	—
Battery replacement	1500–2500	1 day	6 months.
Renovation of the supply chain	2000–5000	2-3 days	3 months.
Supplier PMIC	3500–6000	3-5 days	1 month.
Replacement of motherboard	8000–12000	5-7 days	3 months.

How to choose a service:

🔍 Check reviews on Yandex.Maps or 2GIS (especially pay attention to complaints about unresolved issues").
📋 Ask if you have a job guarantee (at least 1 month).
💰 Check if the diagnosis is included in the cost of the repair.
🔧 Ask to show a faulty part (such as a bloated battery) before repair.

Risks of cheap repairs:

Use of non-original spare parts (e.g. no-name batteries with a capacity of 3000 mAh instead of 4500 mAh).
A cold solder that will fall off in a month.
Reset IMEI (The phone will be a brick without a network).

💡

Before you hand over your phone for repair, take a picture of it. IMEI (printed on a box or under the battery) and back up your data via Mi Cloud (if the phone is even occasionally powered on).

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7.Prevention: How to prevent repeated failures

Even after a successful repair, the Redmi Note 8 Pro may be rebooted if you don’t follow the rules. Here are 5 key recommendations:

🔋 Charging: Use only the original RAM 18W (Avoid turbo-charged charging on the same level. 30W+ — They accelerate the degradation of the battery.
🌡️ Temperature: Do not allow heating above 40°C (Do not play heavy games in the sun, do not leave your phone in your car in the summer).
📱 Updates: Do not install the beta version MIUI — They often contain critical bugs.
🛡️ Protection: Use a depreciation case (such as Spigen Tough Armor) and tempered glass 9H.
🧹 Cleaning: once every 3 months blow the charging connector with compressed air (keyboard cylinder for keyboard).

Myths you shouldn't believe:

❌ "You need to reset your phone once a month to factory settings" - this will only accelerate the wear of flash memory.
❌ "Charging up to 100% kills the battery – modern Xiaomi controllers turn off power when you reach 100%.
❌ "If the phone overheats, you need to put it in the refrigerator – a sharp temperature drop will hurt the fee.

Useful monitoring applications:

AccuBattery – monitors the health of the battery.
CPU Throttling Test – checks whether the processor is throttled due to overheating.
DevCheck shows the temperature of all components in real time.

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FAQ: Answers to Frequent Questions

❓ The phone turns on, shows the Redmi logo and turns off?

This is a classic bootloop. Try: Hold the power. + Volume up for 10 seconds (forced reboot) If it doesn't work, run your phone through Fastboot (instructions in section 4). If that doesn't work, the motherboard malfunctions (repair required).

❓ After the fall, the phone turned off itself?

95% chance of being hardware. Falling could have damaged: Battery contacts (check if the plume is moving away). Power controller (PMIC). Softed circuit board connections (microcracks) If the phone turns on in the supine position, but turns off when it tilts, it's a sign of component dumping.

❓ Can I recover the data if the phone is not turned on?

Yes, but with reservations: 🔧 If the phone is even sometimes booted – connect it to the PC and copy the data through the MTP. 💻 If the phone doesn’t respond, but is identified as Qualcomm 9008 in Device Manager, you can try extracting data through the device. EDL-Mode (requires UFi boxing or EasyJTAG boxing). 🚫 If the board is physically damaged (burnt tracks, chip dumps), data recovery is unlikely.₽ (depending).

❓ Will replacing the motherboard help if nothing works?

Replacing the fee is an extreme measure that: ✅ Solves the problem with reboots (if the reason is the fee). ✅ Keep the phone working on the 1-2 year-end. ❌ Cost you a lot. 60-80% The cost of a new phone. ❌ It'll require a relocation. IMEI, cameras and other components (additional) 1000–2000₽). Alternative: If the repair fee costs more 5000₽, Consider buying a redmi note. 10 Pro - it's more powerful and reliable.

❓ Why did the phone start to reboot again after the firmware?

Probable causes: 📱 Wrong firmware – you’ve flashed a version for another model (like the Redmi Note 8 instead of the Note 8 Pro). 🔌 Power problems - firmware was error-prone due to unstable USB-linkage. 🦠 Virus backup — if you recovered data from the backup, it could contain malware. Solution: run the phone again by selecting clean all mode).