Developer mode in Android 9 Pie is a hidden settings section that gives access to dozens of advanced features: from speeding up interface animation to debugging via ADB and changing screen resolution. However, Google specifically hides this option so that the average user does not accidentally violate the stability of the system. If you want to optimize performance, test applications, or simply experiment with hidden settings, this article will help you unlock developer rights without the risk of bricking your device.

It is important to understand: activating developer mode does not require root-rights or unlocking the bootloader. This is a legal Android feature, but using it incorrectly can cause your smartphone to malfunction. For example, changing settings Dalvik VM or disabling application signature verification may make the system vulnerable to malware. Therefore, before any manipulations, we recommend creating a backup copy of the data.

In this article we will analyze in detail: 1. How to enable developer mode on pure Android 9 and shells (Samsung One UI, MIUI, EMUI). 2. Which settings should be changed to speed up the smartphone, and which ones are better not touch. 3. How to debug the device through ADB and why developers need it. 4. Possible problems after activating the mode and ways to solve them.

1. Step-by-step guide: how to enable developer mode on Android 9

The activation process is the same for most devices on Android 9 Pie, but may vary slightly depending on the manufacturer. Below is a universal algorithm that works on Google Pixel, Samsung Galaxy, Xiaomi, Huawei and other brands.

Check the Android version (must be 9.0 Pie)

Connect device to charge (recommended)

Make sure you have enough free space on your phone (minimum 500 MB)

Disable VPN or proxy (may interfere with some functions)-->

Step 1. Open Settings your smartphone.

Step 2. Scroll down and select About phone (on some devices - About device or Phone information).

Step 3. Find the line Build number (or Build number). It is usually located at the very bottom of the list.

Step 4. Quickly tap on this line 7 times in a row. After the first 3-4 clicks, a pop-up notification will appear with a countdown: "You're almost there! 3 taps left".

Step 5. After On the 7th click you will see the message: "You have become a developer!". Now in the main menu Settings a new section will appear - For developers (or Developer options).

⚠️ Attention: On some devices (Xiaomi, Huawei), after activating the developer mode, additional confirmation may be required via Mi Account or Huawei IDIf the system asks for an account password, enter. it, otherwise access to the settings will be limited.

If the section For developers does not appear right away, try:

  • 🔄 Reboot the device.
  • 🔍 Manually find the section through the search in the settings (enter "developer").
  • 📱 On some firmware (ColorOS, Flyme) the section may be called Advanced → Developer options.

2. Where is the mode located. developer after activation

After successful activation, the section with settings for developers can “hide” in different places depending on the shell:

Manufacturer / Shell Path to section Features
Stock Android (Pixel, Nexus, Android One) Settings → System → For developers The cleanest interface without additional restrictions.
Samsung One UI Settings → Advanced → Developer options Confirmation may be required via Samsung Account.
Xiaomi MIUI Settings → About phone → MIUI version (tap 7 times) → Advanced → For developers On some models, the section is hidden until you enter the password from Mi Account.
Huawei EMUI Settings → System → For developers You may need to disable Zashchitu dannykh in the settings bezopasnosti.

Esli vy ne mozhete nayti razdel, poprobuyte vospolzovatsya poiskom po nastroykam. Vvedite zapros "nomer assembly" ili "developer" — sistema podskazhet tochnoe mestopolozhenie.

💡

On some devices (for example, Sony Xperia), the section For developers may be called Advanced settings. If you do not see it after activation, check for firmware updates - manufacturers sometimes change the location menu.

3. What developer settings can and should be changed

Developer mode offers more than 50 parameters, but most of them are intended for testing and debugging. only safe and useful options that will improve the performance of your smartphone without risk to the system.

🔧 Performance optimization

  • ⚡ Uskorenie animatsii: Change the values in the sections:
    • Animatsiya okon → 0.5x ili Otklyuchit
    • Animatsiya perekhodov → 0.5x
    • Dlitelnost animator → 0.5x
    Effect: The interface will work faster, but the animations will become less plavnymi.
  • 🖥️ Forced GPU acceleration: Enable Forced use GPU (can improve gaming performance, but increases battery consumption).
  • 🔄 Ogranichenie fonovykh protsessov: Ustanovite Maksimum 2–3 protsessa, esli telefon tormozit. Ne rekomenduetsya dlya ustroystv s 4+ GB OZU!

📡 Nastroyki seti i otladki

  • 📶 Rezhim modema: Vklyuchite Peredacha dannykh vsegda active, esli ispolzuete telefon kak tochku dostupa (uvelichivaet raskhod batarei).
  • 🔌 USB debugging: Activate USB debugging to work with ADB (needed to unlock the bootloader or firmware).
  • 🚫 Zapret avtomaticheskogo obnovleniya: Otklyuchite Avtomaticheskoe obnovlenie sistemy, esli khotite kontrolirovat ustanovku obnovleniy.

⚠️ Opasnye nastroyki (ne izmenyayte bez neobkhodimosti!)

  • 🛡️ Otklyuchenie proverki podpisi: Propustit proverku podpisi prilozheniy — delaet ustroystvo uyazvimym dlya virusov.
  • 🔧 Izmenenie Runtime: Vybor sredy vypolneniya (naprimer, s ART na Dalvik) mozhet privesti k tsiklicheskoy perezagruzke.
  • 📱 Imitatsiya displeya: Minimalnaya width — nepravilnoe znachenie narushit masshtabirovanie prilozheniy.
💡

Changing parameters Dalvik VM or Background process limit can lead to unstable system operation. If you are not sure, leave the default values!

4. Debugging via ADB: why you need it and how to configure

ADB (Android Debug Bridge) is a tool for interacting with the device via the command line. It allows you to:

  • 📱 Install and remove applications bypass Google Play.
  • 🔧 Modify system files (requires root).
  • 📊 Obtain system logs for diagnostics sboev.
  • 🔄 Razblokirovat zagruzchik (neobkhodimo dlya proshivki kastomnykh ROM).

Chtoby vklyuchit otladku po ADB:

  1. Activate developer mode (as described above).
  2. In the section For developers find the option Debugging via USB and enable it.
  3. Connect your phone to the PC via a USB cable (use the original cable for a stable connection!).
  4. The phone will ask you to allow debugging - confirm it by checking the box "Always allow from this computer".

To work with ADB on a PC:

  1. Download Platform Tools from Google (included Android SDK).
  2. Extract the archive to any folder (for example, C:\adb).
  3. Open the command line (Win + R → enter cmd) and go to the folder with ADB:
cd C:\adb

adb devices

If the device is displayed in the list, the connection is successful. Now you can execute commands, for example:

adb install app.apk # Installing the APK file

adb shell pm list packages # List of all installed applications


adb reboot bootloader # Reboot into bootloader mode

⚠️ Attention: Commands adbthat change system files (for example, adb shell su), require root access. Their incorrect use can lead to loss of warranty or "brick" of the device (inability to turn on).

5. Possible problems after enabling developer mode

In most cases, activating developer mode goes without consequences, but some users encounter difficulties. Let's look at typical errors and their solutions.

🔴 Problem: The "For Developers" section disappeared after updating

If you updated firmware, and the partition has disappeared - this is normal system behavior. Just repeat the activation procedure (7 taps on Build number).

🔴 Problem: USB debugging does not work

Causes and solutions:

  • 🔌 Non-original cable: Use the cable that goes to included with the device.
  • 🖥️ Missing drivers: Install Google USB Driver or drivers from the manufacturer (for example, Samsung USB Driver).
  • 🔄 Incorrect connection mode: Select on your phone File transfer (MTP) in the USB connection notification.
  • 🛡️ Blocking by antivirus: Temporarily disable the antivirus on your PC.

🔴 Problem: The phone began to slow down after the changes

If you changed the settings Background process limit, Window animation scale or Force GPU rendering, and the device started laggiting, follow these steps:

  1. Return all changed settings to the state Default.
  2. Reboot the device.
  3. If the brakes remain, reset the settings to factory settings (Settings → System → Reset).
What to do if the phone freezes after changing the settings developer?

If the device does not respond to presses, try:

1. Hold the power button for 10-15 seconds to force a reboot.

2. If the screen does not turn on, connect the charger and wait 10 minutes (the battery may be low). data-i="234">3. As a last resort, perform a reset via

3. As a last resort, perform a reset via Recovery Mode (press Power + Volume Up when turning on).

6. How to disable developer mode on Android 9

If you no longer need advanced settings, developer mode can be deactivated. To do this:

  1. Go to Settings → Applications.
  2. Find the application Settings (or Settings) and open it.
  3. Click Storage → Clear data.
  4. Confirm the action. After this, the section For developers will disappear.

Alternative method (on some devices):

  1. Open Settings → System → For developers.
  2. In the upper right corner, click on the switch to disable the mode.
⚠️ Attention: On devices Samsung and Xiaomi disabling developer mode may require re-authorization through the manufacturer's account. If you have forgotten your password, restore it in advance.

7. Frequently asked questions (FAQ)

❓ Do you need root access to enable developer mode?

No, root is not required. Developer mode is a standard Android feature that can be unlocked without jailbreaking the system. However, some options within this mode (for example, changing system files via ADB) may require. root access.

❓ Is it possible to enable developer mode on a locked phone?

No. To activate developer mode, you need access to SettingsIf the device is locked with a pattern or PIN code, first unlock it. (for example, through Find My Device from Google or a factory reset).

❓ Why did the mobile data disappear after turning on the developer mode?

This can happen if you changed the settings Mobile data always active (always active mobile data) or Preferred network type (network type). Return these parameters to the state Default and restart the device. If the problem persists, check the APN settings with your operator.

❓ How to enable the mode. developer on Android 9, if there is no "Build number" item?

On some firmware (for example, on Some Chinese ROMs), the item Build number may be called differently:

  • MIUI Version (on Xiaomi)
  • EMUI Version (on Huawei)
  • Software Version (on Samsung)

Try to tap on all suspicious lines with versions - one of them should work.

❓ Is it possible to enable developer mode via ADB if the sensor does not work?

Yes, but this requires access to ADB via USB debugging, which should already be there is enabled. If debugging is not activated and the sensor does not work, you will need to:

  1. Connect the mouse via OTG cable.
  2. Use the mouse to navigate the menu and activate developer mode.

If USB debugging is already enabled, run command:

adb shell settings put global development_settings_enabled 1

adb shell am broadcast -a com.android.settings.ACTION_DEVELOPMENT_SETTINGS

This will open the developer settings section directly.

Yes, I use it regularly

Yes, but I didn’t change anything

No, I’m afraid to break something

No, I didn’t know about this capabilities-->

Now you know how to unlock and safely use developer mode on Android 9 Pie. We remind you: most of the settings in this section are intended for experienced users and developers. If you are not sure about the purpose of a particular parameter, it is better to leave it unchanged. For experiments, use a backup device or create a backup via TWRP or. standard Android tools.

If your goal is to unlock the bootloader or install custom firmware, be sure to study the instructions for your specific smartphone model. The procedure may differ for Samsung, Xiaomi, Google Pixel and other brands.