Has your Androidsmartphone started to slow down, reboot spontaneously, or produce errors? This doesn't always mean it's time to buy a new device. In 80% of cases, the causes of failures lie in software problems, and not in hardware. Even budget models Xiaomi Redmi or Samsung Galaxy A can work stably with proper configuration, and flagships like Google Pixel 8 or OnePlus 12 sometimes "glitch" due to update conflicts.

In this article - step-by-step guide from simple (clearing cache) to complex (flashing) that will help restore the phone's performance. We will look at how to identify the “weak point” of your device: be it CPU overheating, lack of RAM or viruses in the firmware. We’ll also tell you in what cases it’s worth taking your phone to a service center, and when you can do it on your own.

1. Diagnostics: how to understand why the phone is buggy

Before starting the “treatment”, you need to make a “diagnosis”. Failures Android are divided into three categories:

  • 🔄 Software —lags due to an overloaded system, viruses or errors in the firmware.
  • 🔥 Hardware —overheating, battery wear or damage to chips.
  • 📶 Network —problems with connecting to mobile data or Wi-Fi.

To determine the source of the problem:

  1. Run Settings → System → About phone → Android version and tap on the build number several times. This will open Developer mode.
  2. Go back to Settings → System → For Developers and enable the option CPU Statistics or CPU Monitoring (names may vary).
  3. Use applications like CPU Monitor or AIDA64to track processor load, temperature and RAM usage in real time.
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If the phone gets very hot when charging, check the power supply. Non-original chargers may produce the wrong voltage, which leads to overheating and failures.

Pay attention to symptoms:

  • 🐢 Lags when opening applications → lack of RAM or clogged cache.
  • 🔄 Spontaneous reboots → damaged firmware or faulty battery.
  • 📵 Network disappears → failure in the communication module or problems with the SIM card.
  • 🔋 Rapid discharge → background processes or battery wear.

2. Cleaning the system: removing garbage and freeing memory

The most common cause of brakes is full memory i overloaded cache. Even if you 256 GB on board, system files and temporary application data can occupy tens of gigabytes.

Start with manual cleaning:

  1. Go to Settings → Storage and analyze what takes up the most space. Most often this is:
    • 🎵 Music and podcasts (especially if you use Spotify or Yandex Music offline mode).
    • 📸 Photos and videos in high resolution (for example, pictures in RAW or video 4K).
    • 🎮 Game cache (in Genshin Impact or Call of Duty Mobile can reach 10+ GB).
  • Delete unnecessary files or transfer them to Google Drive/cloud.
  • Clear the application cache: Settings → Applications → [Select an application] → Storage → Clear cache.

    • For automatic cleaning use built-in tools or third-party utilities:

    Tool What cleans Features
    Google Files Junk files, duplicates, large media Free, pre-installed on most phones
    CCleaner Cache, history, temporary files There is a paid version with advanced features
    SD Maid System garbage, remnants of deleted applications Requires root access for deep cleaning
    Built-in utility (for example, Samsung Members or MIUI Optimizer) Cache, background processes, battery Optimized for specific firmware

    Delete unused applications|Clear the cache manually|Transfer photos/videos to the cloud|Check startup applications|Disable background synchronization-->

    Critical mistake of many users: clearing the cache through the "master clean" in one click. This can delete important application data (such as game saves or messenger settings), leading to even more crashes. Always clear the cache selectively!

    3. Performance optimization: settings for acceleration

    If cleaning doesn't help, it's time to dig deeper. Modern firmware (Android 13/14) have hidden functions for optimization, but they are often disabled by default.

    What can be done without root access:

    • ⚡ Disable interface animation: 
      Settings → System → For developers → Window animation scale (0.5x or off)

      Transition animation scale (0.5x or off)
      

      Animator duration scale (0.5x or off)

      This will speed up opening applications on 20-30%.

    • 🔄 Limit background processes: Settings → For developers → Process limit (select "Maximum 2-3 processes").
    • 📱 Enable light mode (if available in the firmware). For example, on Samsung this is Settings → Device care → Light mode.

    For advanced users (requires caution!):

    • 🛠️ Disable unnecessary system applications via adb: 
      adb shell pm uninstall -k --user 0 com.android.bips # example for the "Android Tips" application
      ⚠️ Attention: Incorrect removal of system applications can lead to the phone cannot boot. Before experiments, create a backup copy!
    • 🔧 Change the task scheduler (requires root): 
      echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

      This will help balance performance and power consumption.

    Samsung|Xiaomi/Redmi/Poco|Google Pixel|OnePlus|Huawei/Honor|Other-->

    4. Fighting viruses and malware

    Viruses on Android are not a myth. They can not only steal data, but also load the processorshow advertising or block access to systems. Phones with:

    • 🔓 Unlocked bootloader (bootloader).
    • 📥 Installed APK from unknown sources.
    • 🔄 Outdated version Android (below 10th).

    How to check your phone for viruses:

    1. Install an antivirus with a good reputation: Malwarebytes, Bitdefender or Kaspersky Mobile.
    2. Run deep scan (not fast!).
    3. Check the list of installed applications for suspicious ones (for example, with names like "Super Cleaner Pro" or "Battery Saver Master" —often these are masks for adware).
    4. Open Settings → Accounts and delete unknown accounts with administrator rights.

    Signs of infection:

    • 📢 Pop-up ads in unexpected places (even in the settings!).
    • 🔋 Rapid battery drain for no apparent reason.
    • 📱 Spontaneous installation of applications.
    • 💸 Debiting money from the account (if a mobile bank is connected).
    What to do if the antivirus does not find threats, but the phone behaves strangely?

    Sometimes viruses disguise themselves as system processes. Try:

    1. Boot into safe. mode (press the shutdown button → "Safe Mode").

    2. If there are no problems in safe mode, third-party software is to blame.

    3. Remove recently installed applications (especially from unknown sources).

    4. If the problem persists, reset the phone to factory settings.

    5. Firmware update: when and how to do it

    Outdated firmware is one of the main causes of failures. Manufacturers regularly release patches for:

    • 🛡️ Fixes security vulnerabilities.
    • ⚡ Optimizes performance.
    • 🔄 Fixes bugs (for example, problems with Bluetooth or GPS).

    How to update the firmware:

    1. Go to Settings → System → System update.
    2. If the update is available, download it via Wi-Fi (not via mobile data!).
    3. Make sure that the battery is charged >50%, and start the installation.

    What to do if the update does not install:

    • 🔌 Connect the phone to charge.
    • 📶 Switch to another network (for example, from mobile data to Wi-Fi).
    • 🗑️ Free up 2-3 GB memory (updates require space to unpack).
    • 🔄 Restart your phone and try again.
    💡

    If your phone is older than 3 years, the manufacturer may have stopped supporting updates. In this case, consider installing custom firmware (for example LineageOS), but this requires experience and may void the warranty.

    ⚠️ Attention: Do not interrupt the update process! to "briku" (complete inoperability) of the phone. If the update is stuck on >30 minutes —wait until the battery drains and try again.

    6. Reset to factory settings: last chance before repair

    If all else fails, it’s time to do it hard reset. This will delete all data from the phone, so:

    1. Create a backup:
      • 📱 Contacts, SMS, call log → sync with Google account.
      • 📸 Photo/video → copy to PC or to the cloud.
      • 🎮 Game saves → use the built-in backup functions (for example, Genshin Impact or Clash of Clans).
  • Write down or take a photo of the settings you want to restore (for example, APN for mobile data).
  • Go to Settings → System → Reset settings → Delete all data.
  • Confirm the action and wait for completion (may take 5-15 minutes).

    • What to do after the reset:

    • 🔄 Do not restore data from a backup copy right away! First, check if the phone is working in a stable "clean" state.
    • 📥 Install applications one at a time, observing the system's reaction.
    • 🔋 Give battery 3-4 charge/discharge cyclesto calibrate the controller.

    ⚠️ Attention: On some phones (for example, Xiaomi with a locked bootloader), a reset may require you to enter the old one Mi-account. If you don’t remember it, the phone will turn into a “brick.” Before resetting, unlink your account in Settings → Accounts!

    7. When it's time to take the phone to the service

    If all software methods have been tried, but the phone still:

    • 🔥 Overheats even when idle.
    • 🔋 Discharges in 1-2 hours without load.
    • 📵 Does not pick up the network or Wi-Fi.
    • 🔄 Turns off when charging.

    —the problem is most likely hardware.

    Typical "hardware" malfunction:

    Symptom Probable cause Repair cost (approximately)
    The phone does not turn on, but vibrates The screen is damaged or cable from 3,000 ₽
    Rapid discharge, swollen battery Battery wear from 1,500 ₽
    Overheating when charging, slow charging Faulty power controller from 2,500 ₽
    Artifacts on the screen, flickering Problems with the graphics chip or matrix from 5,000 ₽

    How to choose a service center:

    • 🔍 Check reviews on Yandex.Maps or 2GIS.
    • 📋 Ask if the work is guaranteed (minimum 3 months).
    • 💰 Compare prices: too cheap repairs may mean using non-original spare parts.
    • 📱 If the phone is under warranty, contact official brand service center.

    FAQ: Frequently asked questions about crashes on Android

    🔹 Why does the phone slow down after the update?

    This is normal for the first time 24-48 hours —the system optimizes applications for the new version. If the lags do not go away:

    • Clear the partition cache /system after Recovery.
    • Roll back to the previous firmware version (if you have a backup).
    • Reset the settings to factory settings.
    🔹 Is it possible to speed up an old phone (for example, on Android 7-8)?

    Yes, but with reservations:

    • Install light firmware (for example, LineageOS without GApps).
    • Use launchers like Nova Launcher or Smart Launcher.
    • Disable all animations and background processes.
    • Replace the battery (an old battery can limit performance).

    If the phone was released before 2016, radical acceleration is unlikely - the hardware is physically outdated.

    🔹 Why do applications crash when opening?

    The reasons may be different:

    • Lack of memory — clear the cache or remove unnecessary applications.
    • Conflict versions — update the application and Android.
    • Corrupted data —uninstall and install the application again.
    • Error in firmware —check the forums (for example, 4PDA) for bugs in your model.
    🔹 How to check if some application is draining the battery?

    Open Settings → Battery → Battery usage. Pay attention to:

    • Applications with consumption >10% over the last 24 hours.
    • Processes like Android System or Mediaserver —their high consumption may indicate a virus.
    • Background activity (for example, Facebook or TikTok may consume charge even when closed).

    If you suspect a specific application, turn off background activity for it in the battery settings.

    🔹 Is it worth installing custom firmware?

    This makes sense if:

    • The manufacturer has stopped supporting your model.
    • You need functions that are not in the stock firmware (for example, root or ViPER4Android).
    • You are ready to lose the warranty and risk stability.

    Cons:

    • Possible bugs (for example, non-working NFC or camera).
    • Bank applications (for example, Sberbank Online) can block work on uncertified firmware.
    • Difficulties with updates (you will have to reflash it manually).

    For beginners, we recommend LineageOS or Pixel Experience —they are the most stable.