Xiaomi after the update slows down, overheats or turns off: 7 working ways to return stability

Updating the firmware on Xiaomi smartphones should improve performance, add new features and close vulnerabilities. But in practice, users often face the opposite effect: after installing a fresh version of MIUI or HyperOS, the phone begins to slow down, spontaneously reboot, overheat or refuse to turn on, the reasons for this behavior can be due to firmware errors, as well as conflicts with user settings or installed applications.

In this article, we’ll look at all possible scenarios, from mild failures (such as slow interface animation) to critical ones (the device doesn’t respond to the power button), how to diagnose a problem, what actions to take first, and when to contact a service center. We will pay special attention to the Redmi Note models. 12/13, POCO F5/X5 Xiaomi 13/14, As their owners often complain about bugs after updates 2023–2026 year-end.

1.Diagnostics of the problem: how to understand what the fault of the update

Before you start fixing, make sure the bugs are really firmware-related. Sometimes timing an update can be misleading. Here are the key signs that the software is to blame:

• 🔄 Cyclical reboot (phone turned on, shows logo) MI, switch off and repeat the process).
• 🐢 Lags when opening applications, although before the update everything worked smoothly.
• 🔥 Overheating without load (for example, the body heats up even in standby mode).
• 📵 Network problems: mobile Internet disappears, does not catch Wi-Fi or Bluetooth.
• 🎛️ Failures in settings: reset wallpaper, sound profiles or app permissions.

If at least one of these symptoms occurred immediately after the update, the probability of software failure is 90%, except for mechanical damage (such as a phone fall), which may coincide with the installation of the firmware.

⚠️ Attention: If the phone doesn't turn on at all (no vibration, no charge indicator), the problem may be in the hardware, in which case, first check the charger and cable, and then try to press the power button for 20-30 seconds. If there is no reaction, bring to the service.

2.First actions: cache reset and safe mode

Start with the most innocuous methods that don't affect user data, and 60 percent of the time, they help troubleshoot.

Clearing the cache of the section

The cache partition may contain corrupted files that interfere with the normal operation of the system, and its cleaning will not delete your photos or applications, but will reset temporary data.

1. Turn off the phone.
2. Press the Power button + Volume up until the Mi logo appears.
3. From the Recovery menu, select Wipe & Reset → Wipe Cache (use volume buttons for navigation, power for confirmation).
4. After cleaning, restart the device (Reboot → Reboot to System).

If the phone worked normally after this procedure, the problem was temporary files. If not, move on to the next step.

Safe start-up mode

Safe Mode boots the system without third-party apps, and if it's running smoothly, one of the software you installed is to blame.

How to start:

• Press the power button before the off menu appears.
• Press and hold the item "Switch off (or turn off power)."
• Confirm the transition to safe mode.

In this mode, check:

• 📱 Does the camera, sensors, mobile network work.
• 🔄 Are there lags when opening standard applications (Settings, Phone).

If all is well, remove the apps you installed before the upgrade, one by one, until you find the culprit. Start with optimizers, antiviruses and launchers.

3. Resetting settings: when and how to do

If previous methods didn't work, the next step is factory reset, which is a radical solution, but it eliminates 90 percent of the software failures, and it's important that after the reset, all the data on the phone will be erased, so back up first.

How to reset your settings:

1. Go to Settings → About the phone → Reset settings.
2. Choose to erase all data.
3. Enter a password (if required) and confirm the action.
4. Wait for the process to be completed (it will take 5-15 minutes).

Once reset, the phone will reboot and suggest that you configure it as new. Don't restore the data from the backup right away! First, check the stability of the clean state. If the glitches are gone, the problem was the conflict of settings or applications.

⚠️ Note: On Xiaomi 13 Ultra and POCO F5 Pro after reset may require re-assigning your Mi Account to unlock the bootloader.Make sure you remember your login and password!

4. Fastboot Flash-through: for power users

If the reset doesn't work, you can still manually flash through Fastboot mode, which is suitable for cases where:

• 📱 The phone is switched on but is not working smoothly.
• 🔄 Hangs on the logo. MI or cyclically reboot.
• 🚫 I can't get into Recovery.

You'll need firmware.

• Computer with installed Xiaomi drivers (official site).
• USB Type-C cable (original)
• Firmware for your model (download only from xiaomifirmwareupdater.com or mi.com).
• Mi Flash Tool (version no lower than 2023.4.1)

Step-by-step:

1. Unpack the archive with firmware in a folder without Cyrillic characters (for example, C:\Xiaomi\fastboot_rom).
2. Turn off the phone and put it in Fastboot mode: pinch Power + Volume down.
3. Connect your phone to your PC. The Android Bootloader Interface should appear in the Device Manager.
4. Open the Mi Flash Tool, press Select and point the path to the firmware folder.
5. Select Clean All mode and press Flash.
6. Wait for the end (10-20 minutes) and the phone will reboot automatically.

Critical information: On models with a locked bootloader (for example, Xiaomi 14 for the European market), flashing through Fastboot may require unlocking the bootloader.This process erases all data and requires binding to the Mi Account for at least 72 hours.

💡

Before you run your firmware, check the bootloader version! If you are running an older version than the current one, an anti-rollback error may occur that will lock the phone permanently.

5. rollback to the previous firmware version

If the upgrade has caused more problems than benefits, you can return the old version of MIUI or HyperOS, a method called downgrade.

• 🔒 Possible to lock the bootloader (anti-rollback protection).
• 📱 Data loss (required backup).
• 🔄 Not all models support rollback (e.g. Xiaomi) 13T hyperOS).

How to check compatibility:

1. Find your model on the Xiaomi Firmware Updater website.
2. If you see the firmware list, if you have a Downgrade allowed mark next to the version, you can roll back.
3. Download the firmware and run through Fastboot (instructions in the previous section).

For Redmi Note 11/12 and POCO F4 models, a pullback on MIUI 13 often helps if problems started after the HyperOS transition.

• 🔄 After a rollback, some features (such as new gestures or camera modes) may disappear.
• 📵 Possible compatibility problems of applications optimized for the new OS version.

💡

A rollback to the previous firmware version is a last resort. Before you do that, try all the other methods and make sure your model supports downgrade.

6. Hardware inspections: when it is not the fault of the software

If none of the software methods worked, maybe the problem is the hardware. The firmware update might just show an existing malfunction.

6.1. Battery.

Symptoms:

• 🔋 The phone turns off at 20-30% charge.
• 🔥 Heavily warms up during charging or playing.
• ⚡ Quickly discharged (for example, in 2-3 hours without loading).

How to check:

1. Install the AccuBattery app and see the battery status.
2. If the capacity has fallen below 70% of the nominal - the battery needs to be replaced.

6.2. Memory (eMMC/UFS)

Symptoms:

• 📱 Phone brakes when recording video or installing apps.
• 💾 Apps suddenly close with an error.
• 🔄 No photos or files are saved.

How to check:

1. Run the memory test through the engineering menu: type in the dial number ##4636## → Test → Memory.
2. Use the AIDA64 app (Storeroom section) if the read/write speed is below normal, memory is degraded.

Processor overheating

Symptoms:

• 🌡️ The phone heats up even for simple tasks (for example, in messengers).
• 🎮 The app crashes with the error "Device overheated".
• 🔄 Spontaneous reboots during games.

How to check:

1. Set the CPU Monitor and look at core temperature.
2. If the temperature exceeds 60 ° C in the idle - a replacement of the thermopast or a diagnosis of the motherboard is required.

If you find a hardware fault, do not try to fix the phone yourself (especially if it is warranty).

7. Contacting the service center: when necessary

There are situations where self-intervention will only aggravate the problem.

• 🔧 Phone does not turn on at all (no reaction to charging or buttons).
• 💦 Artifacts appeared on the screen (stripes, flickering, broken pixels).
• 🔥 The phone overheats before it turns off (for example, it shuts down at 70).°C).
• 📡 Mobile network or Wi-Fi is completely lost (even after the reset).
• 🔒 After the firmware, there was an error "This" MIUI version cannot be downgraded".

What to do before visiting the service:

1. Take screenshots of errors (if the phone is switched on).
2. Write down the model, firmware version and IMEI (on the box or via *#06#).
3. Check if you have a guarantee (check your checks or Mi Account).

The service center can offer:

• 🔄 Refuse the phone with the official firmware through EDL-regime (for “bricks").
• 🔧 Replace the faulty component (battery, charging connector, memory chip).
• 📄 Provide a diagnostic act for warranty repair.

⚠️ Note: If the phone was purchased in China or on AliExpress, the warranty may not be valid in your country!

FAQ: Frequent questions after Xiaomi update