SysDump on Xiaomi: A Complete Guide to Creating and Using a Dump System

If your Xiaomi smartphone malfunctions — spontaneously restarting, crashing into fastboot, or apps crashing for no apparent reason — support engineers often ask for SysDump. This tool captures the state of the system at the time of the failure, including kernel logs, process information and hardware components. Without such a dump, diagnosing the problem becomes a coffee-dwelling divination: support will not be able to determine exactly whether hardware, firmware or a particular application is to blame.

In this article, we will discuss not only how to make SysDump on Xiaomi (including models on the Internet). MIUI You will learn where dumping is useless, how to avoid typical errors in its creation, and why it is sometimes better to use alternative methods of collecting logs. Separately, we will dwell on the nuances for devices with an unlocked bootloader and custom firmware - here SysDump can behave unpredictablely.

What is SysDump and Why You Need It

SysDump is an archive of technical information about the state of the smartphone at the time of its creation, unlike conventional screenshots or screen recordings, it contains:

• 📜 Logs of the kernel (dmesg, last_kmsg) — Critical Error Messages of Equipment and Drivers.
• 📊 Process Snapshots (top, ps) – which applications consumed resources before crashing.
• 🔧 System configuration - firmware versions, core modules, SELinux parameters.
• 🔌 Connected device data – state of Wi-Fi, Bluetooth, battery.

SysDump’s primary purpose is to diagnose hardware and software failures, for example, if a Redmi Note 12 smartphone suddenly shuts down at 30% charge, the dump will help to find out whether the battery controller is to blame or an error in the energy-saving core. Xiaomi support requires such logs to:

• ⚡ Bootloop Analysis (Cyclical Reboot).
• 🔄 Diagnostics of spontaneous rebuts (reboots without cause).
• 📵 Research on network problems (signal loss, errors) 4G/5G).
• 🎮 Finding out the causes of lags in games or “departures” of applications.

⚠️ Note: SysDump will not help if the problem is caused by mechanical damage (such as a cracked screen or moisture.

It's important to understand that the dump is recording the state of the system at the time it's created, not retrospectively. If the smartphone has already rebooted after a failure, SysDump won't show you the reason, you need to start it before the reboot, which is why engineers ask you to create a dump immediately after the problem occurs, without waiting for it to happen again.

When SysDump is Useless: Alternative Log Collection Methods

Although it's versatile, SysDump is not a panacea, and there are situations where it's either not going to provide useful information or it's not going to be possible to create it.

If your case falls in the table above, don’t waste time on SysDump. For example, it is more effective to collect logs via adb during the day to diagnose a quick battery discharge:

adb shell dumpsys batterystats --reset


adb shell dumpsys batterystats --enable full-wake-history



Use your smartphone as usual for 24 hours, then:



adb shell dumpsys batterystats > batterystats.txt

For problems with Wi-Fi or mobile network, an extended network log will be more useful:

adb shell logcat -b radio -b events -v time > network_logs.txt

⚠️ Note: If the Xiaomi smartphone is in bootloop (infinite reboot), but at least briefly boots into the system, try creating SysDump in blind: press the button combination for a screenshot (Loudness down). + Power) and hold on for 10 seconds. On some models, this will cause a dump to be created.

Step-by-step: how to make SysDump on Xiaomi

The process of creating a dump differs depending on the firmware version (MIUI Here is a general guide that is suitable for most models (Redmi, Poco, Xiaomi series). 11/12/13).

Method 1: Through the settings menu (for a working system)

If the smartphone is turned on and more or less stable:

1. Open the Settings app → The phone.
2. Tap 5-7 times on the item Version MIUI (Version of HyperOS until you become a developer!.
3. Go back to the main menu of settings → Additional → For developers.
4. Activate the debugging switch over USB and confirm the resolution.
5. Connect your smartphone to your PC and execute the command: adb shell am start -a android.intent.action.SYSDUMP
6. On the screen of the smartphone will appear a notification about the creation of the dump. Wait for completion (usually 2-5 minutes).
7. The dump file will be saved along the way: /sdcard/MIUI/debug_log/ (or /sdcard/HyperOS/debug_log/).

Method 2: Through a button combination (for “hang” devices)

If the smartphone is frozen, but the screen reacts to touch:

1. At the same time, press the Volume Up buttons. + Eating and holding for 10-15 seconds.
2. If the screen goes out and there's a vibration, release the buttons. In 30 to 60 seconds, the dump will be created.
3. The file will appear in the folder. /sdcard/MIUI/debug_log/ or on the desktop (in HyperOS).

For devices in bootloop state (cyclic reboot), try:

1. Wait for the moment when the smartphone will be loaded for a short time (the logo will appear). MI download-animation).
2. Press the Volume Down Immediately + 10 seconds power.
3. If the dump is successful, check the folder after restarting. /sdcard/.

Method 3: Through Fastboot (for a broken system)

If the smartphone does not boot into the system, but there is access to fastboot:

1. Connect the device to the PC and switch to fastboot mode (clip Volume down). + Power with the phone turned off).
2. Run the command to create a dump: fastboot oem sysdump
3. Wait until it is completed (it can take up to 10 minutes) the file will be saved to the PC in the current directory.

⚠️ Note: Some models (Xiaomi 12 Pro, Redmi) K50) The fastboot oem sysdump command may not work due to a blocked bootloader, in which case you will need to unlock through the Mi Unlock Tool, which will reset all data!

Where to look for a SysDump file and how to send it in support

Once the dump is successfully created, it needs to be removed from the smartphone and handed over to Xiaomi engineers, and let’s look at where to find the file and how to archive it properly.

Paths to SysDump files

Depending on the firmware and model, the path may differ:

• 📁 MIUI: /sdcard/MIUI/debug_log/sysdump_YYYYMMDD_HHMMSS.tar.gz

If the folders debug_log No, check the root catalog. /sdcard/ — Sometimes the dump is stored right there under the name sysdump.tar.gz or dumpstate_*.zip.

How to properly archive and send the dump

Before sending in support:

1. Check the file size – it should be at least 50 MB (smaller size indicates an incomplete dump).

If the dump is too large (over 500MB), upload it to Google Drive or WeTransfer and send a link. Don't send files via instant messengers - they often compress archives, which makes logs unreadable.

💡

If Xiaomi support asks for error logs without specifying, specify whether SysDump or logcat is enough. -d > logcat.txt.

Common SysDump Errors and How to Avoid Them

Even if you follow the instructions, users often face problems, and let's look at the most common errors and their solutions.

If, when creating a dump, through ADB You see a Security exception error, which means that the rights for system utilities are disabled on the device:

1. Enable USB Debugging (Security Options) in the Developer Settings.
2. Follow the command: adb shell pm grant com.android.shell android.permission.DUMP
3. Repeat the attempt to create a dump.

On custom firmware devices (like LineageOS or Pixel Experience), SysDump may not work due to the lack of Xiaomi-branded utilities, in which case use alternative methods of collecting logcat or dmesg logs.

SysDump Analysis: What You Can Learn on Your Own

While fully decrypting the dump requires knowledge of Linux and Android, some errors can be identified by yourself.

Key files in the SysDump archive

The dump archive contains dozens of files, but the following are important for the initial analysis:

• 📄 dmesg.txt – kernel logs (critical hardware errors).
• 📄 last_kmsg — last kernel message before failure.
• 📄 cpuinfo – information about the processor and its load.
• 📄 meminfo – the use of RAM.
• 📄 battery_info — Battery data (voltage, temperature).

Examples of diagnostics by logs

1. spontaneous reboots (bootloop):

Open the file. last_kmsg and look for lines from:

• Kernel panic is a critical kernel error.
• Watchdog bite – a watchdog timer (usually due to the processor freezing) was triggered.
• Thermal engine – overheating of components.

2. Network problems (Wi-Fi/mobile):

Check dmesg.txt for the presence of:

• wlan: [E:HDD] Disconnected – Wi-Fi connection breakage.
• rmnet_data: rmnet_data_close — mobile-network failure.

Rapid discharge of battery:

In the file battery_info pay attention:

• health: 3 — battery in critical condition (requires replacement).
• voltage_now: <3400000 — Low voltage (possibly faulty controller).

For convenience of analysis, utilities can be used:

• 🔍 Logcat Reader (for logcat).

⚠️ Note: If you find a string with hwcomposer: vsync timeout or SurfaceFlinger: timeout waiting for h/w composer, the problem is with the graphics driver. This is typical for devices after a firmware update, it will help to reset to factory settings or roll back to the previous version.

SysDump on custom firmware and devices with unlocked bootloader

If your Xiaomi is running on unofficial firmware (LineageOS, ArrowOS, Pixel Experience), a standard SysDump may not work or give incomplete data.

Alternative ways to collect logs

Use commands. ADB Manual collection of critical data:

1. Logs of the kernel: adb shell su -c "dmesg > /sdcard/dmesg.txt"
2. Process information: adb shell su -c "top -n 1 -d 1 > /sdcard/top.txt"
3. Battery status: Adb shell su -c "cat /sys/class/power_supply/battery/uevent > /sdcard/battery.txt"

For devices with unlocked bootloader, you can create an extended dump through TWRP:

1. Download to TWRP Recovery.
2. Choose Advanced → Terminal Command.
3. Enter: dd if=/proc/last_kmsg of=/sdcard/last_kmsg.txt dmesg > /sdcard/dmesg_recovery.txt

If you use HyperOS-based firmware, note that the log structure has changed. For example, kernel logs can now be stored in:

/sys/fs/pstore/console-ramoops

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On custom firmware, SysDump is often useless due to the lack of Xiaomi-branded utilities, in which case, when contacting for support, make sure that the device runs on unofficial software - they may refuse warranty repairs.

Frequently Asked Questions (FAQ)