The Xiaomi Redmi 9A is one of the most popular budget smartphones, but even with such a model, there are hidden features that are not available to the average user.Developer Mode gives you access to advanced settings that allow you to fine-tune performance, debug applications or even speed up the device. However, many owners of the Redmi 9A do not know how to activate it, because by default this option is hidden in the system.
In this article, you'll find a step-by-step guide with pictures, an explanation of each step, and security tips, and we'll also tell you what features become available after you turn on the developer mode, and we'll warn you against common errors that can cause smartphone malfunctions, so if you want to unlock USB debugging, change interface animations, or optimize background processes, this guide is for you.
Why do I need a developer mode on Xiaomi Redmi 9A?
Developer mode isn't just a geek secret, it's useful even to regular users if you know how to use it, and here are the main reasons why you should include it:
- 🔧 Debugging by USB: without this, it is impossible to connect a smartphone to a computer for firmware, data recovery or use tools like ADB.
- ⚡ Speed up the interface: you can disable or reduce the animation of transitions between windows, which will make the smartphone visually faster.
- 📱 Background control: limiting the number of running applications saves battery power and RAM.
- 🔄 Secondary display simulation: useful for testing applications or connecting to an external monitor.
- 🛠️ Advanced network settings: choosing the type of mobile network (2G/3G/4G), traffic-recording.
On the Redmi 9A, with its modest specs (2GB of RAM, MediaTek Helio G25 processor), these settings help to squeeze the most out of the device. For example, disabling background MIUI optimization can increase battery life by 10-15%.
⚠️ Attention: Some settings in developer mode can lead to unstable smartphone operation if changed at random. GPU-acceleration for all applications often causes graphic artifacts or overheating.
Preparing a smartphone before turning on the developer mode
Before you activate hidden settings, make sure your Redmi 9A is ready to change.
- Battery charge: must be at least 30%. In rare cases, activation of the mode can cause a reboot.
- Free space: The internal drive must have at least 500 MB (settings are saved in the system partition).
- MIUI Updates: If a new firmware version is available, it’s better to upgrade – older versions may have bugs displaying the developer menu.
- Backup: Although enabling the mode does not delete data, we recommend creating a backup of important files (photos, contacts) in case of a crash.
Also make sure that your smartphone doesn’t have a child lock or corporate restrictions (if the device was issued by your employer), which can block access to your system settings.
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If you have a custom launcher (like Nova Launcher), temporarily return the standard MIUI Launcher. In some cases, third-party shells hide the About phone item in the settings.
Step-by-step: how to turn on the developer mode on Redmi 9A
The activation process is the same for all Xiaomi MIUI-based smartphones, but we will describe it in detail with regard to the Redmi 9A. Follow the instructions carefully - skipping a step can lead to the fact that the developer menu does not appear.
Step 1: Open your smartphone settings
Click on the Settings icon on the home screen or in the app menu. If you don't have the icon, swipe down from the top of the screen and tap the gear icon in the top right corner.
Step 2: Go to the About Phone section
Scroll down the settings list and select About Phone (usually the last one). On some firmware, this section may be called About Device or Phone Information.
Step 3: Find the MIUI version
In the window that opens, look for the line MIUI Version, which is located at the top of the screen, and press it 7 times in a row with an interval of no more than 1 second between touches.
After the third or fourth tap, notifications will start appearing on the screen like, You're almost there! 4 taps left → 3 taps left → and so on.
Step 4: Confirmation of inclusion
After the seventh tap, you will see a message: You became a developer!
or
Developer mode is on.
This means that the hidden menu has been successfully activated.
☑️ Verification of activation success
Step 5: Access to the Developer Menu
Now go back to the main Settings menu and find a new section: Settings → More → For developers
If it is not, try using the search by settings (the magnifying glass icon at the top of the screen) and enter a query for developers.
⚠️ Note: Some of the Redmi firmware 9A (especially the global versions MIUI) The developer menu can be called Developer options and can be located in the System or Additional settings section. If you do not find it, check the system language (should be Russian or English).
The main settings of the developer mode: what can and cannot be changed
Once activated, you'll have access to dozens of options, but changing them at random is dangerous. We've compiled the most useful and safe options for the Redmi 9A, as well as those that are not recommended to touch.
Useful settings (can be changed)
| Setting up | What's he doing? | Recommended value |
|---|---|---|
| USB debugging | Allows you to connect your smartphone to your PC for firmware or recovery | Turn on (if necessary) |
| The scale of window animation | Speeds up or disables animation when opening applications | 0.5x or off. |
| Limit of background processes | Limits the number of applications running in the background | Max. 2 Processes (to save battery) |
| Do not turn off the screen during charging | Useful for using a smartphone as a navigator in a car | Insert (as appropriate) |
| Forced. GPU-rendering | Speeds up the schedule, but can cause overheating | It is better not to include the Redmi 9A |
Dangerous settings (not recommended to change)
- ⚠️ Unlocking OEM — This may result in data resetting at the next update.
- ⚠️ Disabling the verification MIUI — reduces the security of the system.
- ⚠️ Changing the size of the log buffer – can fill the memory with system logs.
- ⚠️ Inclusion 4x MSAA — It severely loads the processor, worsens autonomy.
What happens if you reset the developer mode settings?
How to turn off developer mode on Redmi 9A
If you no longer need advanced settings or want to return your smartphone to factory status, you can deactivate the developer mode.
- Go to Settings → Additional → For developers.
- At the top of the screen, look for the Developer Options (Developer Mode) switch.
- Move the slider to the off position.
- Confirm the action if the system requests a password or PIN-code.
Once disabled, all changes made to the developer menu will reset to default values, for example, if you turn off animation, it will become standard again.
If the switch is missing or inactive, try an alternative: Settings → Applications → Application Management → Three dots (menu) → Resetting.
This will reset all application settings, including developer mode.
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Turning off the developer mode doesn't delete data from the phone, but it resets all the changed settings. If you're planning to sell or transfer a smartphone, you'd better do a full reset.
Frequent problems and their solutions
Even with accurate follow-up, Redmi 9A users sometimes have trouble, and we've collected some of the most common bugs and ways to fix them.
Problem 1: The Developer Menu doesn’t appear after 7 clicks
Possible causes and solutions:
- 🔄 Not fast enough: try pressing at 0.5 seconds intervals.
- 📱 System failure: restart your smartphone and try again.
- 🔒 Firmware limitations: on some versions MIUI for Redmi 9A (for example, MIUI 12.0.8) must be updated first.
- 🛠️ Resetting: If nothing helps, reset to factory settings (Settings) → The phone. → Resetting settings).
Problem 2: You can't turn on USB debugging
If the USB Debugging Switch is inactive or the error "Resolution Rejected" appears:
- Make sure your smartphone is unlocked (no pattern lock or PIN-code-in).
- Connect the device to the computer and confirm the trust of this PC (a request will appear on the Redmi 9A screen).
- Check if the ADB drivers are installed on your computer (you can download from the Xiaomi website).
- If MIUI 12.5+ is used, you may need to enable the USB Installation in the same menu.
Problem 3: The smartphone overheats after changing the settings
On the Redmi. 9A It is especially important not to include at the same time "compulsory" GPU-rendering "4x MSAA" — It causes the battery to overheat and discharge quickly, if the phone is already warming:
- Return all options in the developer menu to factory ones.
- Turn off MIUI Background Optimization (if included).
- Install a temperature monitoring app (like CPU Monitor) and check which application is loading the processor.
What else can you do with the Redmi 9A?
Developer mode is just the beginning, and you can use it to:
- 🔓 Unlock the bootloader to install custom firmware (for example, LineageOS).
- 📱 Install TWRP Recovery – an alternative recovery menu that allows you to create backups of the entire system.
- 🔄 Switching to a global version MIUI, If you have a regional option (for example, Indian or Chinese).
- 🎮 Emulate the clicks for automatic playthrough (useful for clinkers like) AFK Arena).
However, remember: any manipulation of firmware is warranty-free and can lead to brick (turning a smartphone into a “brick”). If you are a beginner, it is better to limit yourself to the safe settings from the developer menu.
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Before unlocking the bootloader on Redmi 9A, be sure to link the Mi Account to the device. Without this, after reset, the smartphone will require entering a login / password even to turn on!