The Xiaomi Mi 9 Lite (also known as the CC9 in China) is one of the brand’s most popular smartphones, but even years after its release, many users are unaware of the device’s hidden capabilities. The developer mode offers access to dozens of additional tweaks, from fine performance optimization to ADB debugging and bootloader unlocking.
In this article, you will find the latest instructions for MIUI 12/13/14 (including global and Chinese firmware), deal with typical activation errors, learn which settings should be changed first and which should not be touched to avoid system failures.
Why you need a developer mode on Xiaomi Mi 9 Lite
By default, MIUI hides most of the technical settings to prevent accidental changes that could disrupt the stability of a smartphone, but for power users, the developer mode is becoming a powerful tool.
- 🔧 Debugging by USB: Without it, you can not connect to Android Studio, use it. ADB for installing custom firmware or data recovery.
- ⚡ Performance optimization: activation/disconnection of animations, limitation of background processes, forced activation GPU-rendering.
- 📱 Unlocking the bootloader: the first step to install TWRP or custom ROM (For example, LineageOS).
- 🔄 Reset battery statistics: useful if the smartphone began to discharge quickly after the update.
- 🎮 Location emulation: To test geo-dependent applications without real movement.
Not all settings are equally useful, however. For example, forcing the 4x MSAA to be turned on in games can overheat the Qualcomm Snapdragon 710, and disabling the MIUI integrity check can cause update problems. Change settings consciously, after first examining their impact on the device.
Preparing a smartphone before turning on the developer mode
Before activating the hidden menu, follow a few mandatory steps to avoid problems:
- Check out MIUI version: Settings path → About phone → MIUI version. Instructions are suitable for versions 12.0.1.0 and later (including MIUI 14 based on Android 13).
- Battery charge: Make sure the charge level is above 30%. At low charge, the system can block access to settings.
- Backup: Backup important data through Settings → Additional → Backup and Reset. This insures against loss of information in failed experiments.
- Disable VPN/Proxy: Some corporate networks block access to system settings.
Important: If your Mi 9 Lite is linked to a Mi Account with Find Device activated, you may need to re-authorize once the developer mode is enabled.
Check out the MIUI version (12+)
Charge your smartphone (>30%)
Create a backup copy of the data
Disable VPN/Proxy
Remember the password from Mi Account-->
Step-by-step instruction: how to turn on the developer mode
The activation algorithm is the same for all versions of MIUI, but the path to the menu may vary slightly.
- Open Settings (the gear icon on the home screen or in the application menu).
- Scroll down and select About Phone.
- Find the line MIUI version and 7 times quickly tap it (with an interval of no more than 1 second between clicks).
- After 3-4 taps, a pop-up notification will appear: “You’re almost there!”.
- At press 7, the system will display a message: “You became a developer!”
If nothing happens,
- ❌ You are moving too slowly, increase the pace.
- ❌ Use the wrong line (you need the right version) MIUI, Not the Android version).
- ❌ On the smartphone installed custom firmware without support for the developer mode.
After successful activation, a new section will appear in the main Settings menu: Additional → For developers. If it is not, restart the device.
What to do if the developer mode is not turned on?
Where to find and how to open a menu for developers
Once activated, the partition is hidden in the depth of the settings.
- Open the Settings.
- Go to Additional (in some versions - System and device).
- Select Developer Options (may be called Developer Options or Developer Options in English firmware).
If there is no section:
- 🔄 Restart your smartphone – sometimes the menu only appears after the reboot.
- 🔍 Use the search by settings (the magnifying glass icon at the top of the screen) and enter the query "developer".
- 📱 Check if the partition is hidden through the Mi Account settings (relevant for corporate devices).
Note: on some firmware (MIUI EU or custom builds), the developer menu may be blocked by a password. By default, it is 1234 or 0000, but if you changed it, remember the combination.
💡
If you use developer mode frequently, add a shortcut to the home screen: hold your finger in the free screen space → Widgets → find Settings → drag the shortcut for developers.
What settings can be changed safely (and which can not)
There are more than 50 options on the developer menu, but most of them are for testing and can disrupt the stability of the work.
| Type of setup | Parameter | What's he doing? | Risks. |
|---|---|---|---|
| ✅ Safe. | USB debugging | Allows you to connect to the PC for debugging | No (but turn it off after use) |
| ✅ Safe. | Do not turn off the screen during charging | Useful for presentations or testing | Accelerated wear of OLED-matrix |
| ⚠️ Careful. | Forced. GPU-rendering | Accelerates graphics in games/applications | Overheating, quick battery discharge |
| ❌ Dangerous. | Disable MIUI check | Allows installation of unsigned APKs | Violation of updates, security vulnerabilities |
| ❌ Dangerous. | Background processes → No restrictions. | Prohibits the system from killing background tasks | Hanging, lag, overheating. |
Critical warnings:
⚠️ Note: Change of the Minimum Width (dp) parameter in the Scaling section may cause the interface to fail MIUI. If after changing the screen became unreadable - reset the settings through ADB: adb shell settings put global forced_display_size_reset 1
⚠️ Warning: Activating the Don't Keep Activities option will shut down all apps when you switch between them, which is useful for testing, but will make the smartphone unusable for everyday use.
💡
The most useful settings for the average user are: USB debugging (for backups), Windows animation = 0.5x (speed up the interface) and Wi-Fi background check (for battery savings).
What to do if the developer mode disappears after the update
After installing the new version of MIUI (especially major updates like MIUI 13 → MIUI 14), the developer menu may disappear.
- 🔄 Resetting default settings (relevant for "dirty" updates via OTA).
- 🔒 Blocking Xiaomi on some regional firmware (for example, for the EEA).
- 🐛 Firmware bug (often found in the first builds of new versions).
Recovery methods:
- Repeat activation: tap again 7 times on the MIUI version.
- Reset settings (without data loss): Settings → Additional → Reset settings → Reset network/application settings.
- Use it. ADB (Adb shell settings put global settings development_settings_enabled 1 adb shell am start -n com.android.settings/.DevelopmentSettings
If nothing works, check to see if an antivirus (such as Mi Security) or a cache cleaner app is blocking access, and in extreme cases, you’ll have to wait for a patch from Xiaomi or roll back on the previous firmware version.