Developer mode on Xiaomi Redmi Note 9: how to turn it on and why it is necessary

Xiaomi Redmi Note 9 smartphones based on MIUI hide many useful features behind the so-called "developer mode" This tool allows you to fine-tune the system, speed up animations, debug applications and even improve performance, but by default the option is disabled — it must be activated manually through a special menu.

Many users are afraid to turn on this mode for fear of breaking their phone or losing their warranty. In fact, the settings for developers are completely safe if you don't change the settings at random. They are designed not only for programmers, but also for experienced users who want to squeeze the maximum out of the Redmi Note 9. In this article, a step-by-step guide with pictures, an explanation of each option and tips on how to avoid typical errors.

⚠️ Important: some settings in developer mode can affect the stability of the smartphone, such as disabling the verification of the signature of applications (USB-debugging) or parameter modification GPU-And rendering sometimes causes disruptions. All the changes you make are at your own risk -- but with the right approach, they'll only improve the experience.

Why turn on the developer mode on Redmi Note 9?

At first glance, it may seem that these settings are only needed by programmers, and in fact, even a regular user will find useful features here:

• ⚡ Speed up the interface – you can disable or reduce the animation of transitions between screens, making the smartphone more responsive.
• 🔧 Debugging by USB — mandatory option to connect to the PC through ADB, Firmware through Fastboot or working with tools like Xiaomi ADB/Fastboot Tools.
• 📱 Background control – limiting active applications saves battery power and RAM.
• 🎮 Graphic settings - forced use GPU for rendering or changing screen resolution in games.
• 🔒 Unlocking the bootloader is the first step to install custom firmware (LineageOS, Pixel Experience) or obtain root rights.

For example, if your Redmi Note 9 started to slow down after the MIUI update, in developer mode you can forcefully restrict background processes or disable unnecessary system services. and gamers will appreciate the ability to turn on 4x MSAA for smoothing graphics in games - this makes the picture smoother, although it slightly increases the load on the processor.

⚠️ Note: some settings (e.g., Do not turn off the screen or Simulate secondary display) may drain the battery faster than usual. Use them only when necessary and remember to return the default values.

Step-by-step: how to enable settings for developers

The activation process is the same for all Xiaomi smartphones on MIUI, including the Redmi Note 9, Note 9 Pro and Note 9S. The main thing is to know the correct sequence of actions and not miss a single step.

1. Open the Settings app (the gear icon on the home screen or in the application menu).
2. Scroll down and select About Phone (sometimes called About Device).
3. Find the MIUI version line and tap it 7 times in a row, and after each tap, a pop-up notification will appear, saying, "6 steps left," "5 steps left," and so on.
4. On press 7, you will see a message saying, "You've become a developer!" which means that the mode has been successfully activated.
5. Return to the main Settings menu – now there will be a new section Additional (or Advanced Settings), and in it – the item For developers.

If nothing happens after 7 taps, check:

• 🔹 You're just tapping the Version. MIUI, Not on the phone or Android version.
• 🔹 Pressing should be fast, but not chaotic – the interval between them is no more 1-2 seconds.
• 🔹 Some of the majors (e.g., global) MIUI 12.5) A password or pattern lock may be required after activation.

Where to find the settings for developers after inclusion

Once activated successfully, the new partition can be hidden in different locations depending on the version of MIUI.

If the partition suddenly disappeared after the system update, repeat the activation procedure (7 clicks on the Version). MIUI). Sometimes. MIUI Resets access to these settings after major updates.

⚠️ Note: on some custom firmware (e.g. Xiaomi.eu) the path may be different. If you don't find a section, try searching in the settings - type "developer".

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If the developer settings are gone after the MIUI update, try resetting the Settings app through Settings → Apps → App Management → Settings → Storage → Clear the data. This will return all hidden menus, but will not affect user data.

Top.-5 Useful settings for ordinary users

Not all options in the developer mode are needed by the ordinary owner of the Redmi Note 9. We have selected the most useful features that will really improve the performance of the smartphone without risk to the system.

1. Accelerating interface animation

By default, MIUI uses smooth transitions between screens that are visually beautiful but slow down.

1. Go to Settings. → For developers.
2. Find options: Window animation scale → set 0.5x or Off. Transition animation scale → 0.5x Animator duration scale → 0.5x

The effect is noticeable immediately: applications open faster, and the interface becomes more responsive.

2. debugging over USB (to connect to a PC)

This option is mandatory if you plan to:

• 🔹 Switching your phone through Fastboot or Mi Flash Tool.
• 🔹 Install TWRP custom-made.
• 🔹 Use utilities like Xiaomi ADB/Fastboot Tools for deep customization.

To include:

1. Activate the debugging switch over USB.
2. Confirm the permission in the window that appears (always allow from this computer).

3. Limitation of background processes

If the Redmi Note 9 is rapidly discharged or braked, the background apps are to blame.

• 🔹 Limit of background processes → Select Process Maximum 2 (saves battery, but some notifications may come with a delay).
• 🔹 Don't keep up → Turn on for individual applications that shouldn’t work in the background.

4. Forced use of the GPU

For gamers: Enable the option Forced to use GPU will force the graphics processor to process 2D-It's useful in heavy games (Genshin Impact, Call of Duty Mobile), but it can slightly increase battery consumption.

5. Unlocking OEM

If you plan to get root rights or install custom firmware, activate OEM Unlock. Without this, you can not unlock the bootloader through the Mi Unlock Tool.

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Changing the parameters of the animation scale and the background process limit gives the greatest performance gains without risk to the system. Start with these settings if you want to speed up the phone.

What to do if the developer mode is not turned on?

Sometimes users have problems activating, and here are the most common cases and their solutions:

1. 7 presses on "Version" fails. MIUI"

Causes and solutions:

• 🔹 Slow presses – tap faster, with an interval of no more than 1 second.
• 🔹 Wrong line – make sure you click on Version MIUI, Not a phone model or an Android version.
• 🔹 Firmware restrictions - on some versions MIUI Redmi Note 9 (e.g. Chinese) may require a Mi Account link or additional confirmation.

2.The section "For developers" disappeared after the update

After major updates, MIUI sometimes resets access to these settings.

• 🔹 Repeat the procedure with 7 taps.
• 🔹 Clear the Settings app data (see the tip above).
• 🔹 Check if restrictions are set through Parental Controls or corporate policies (relevant to work phones).

3. You can not change the settings - gray text or lock

Some options may be blocked:

• 🔹 Factory restrictions – on phones with a blocked bootloader, part of the functions (for example, Unlock) OEM) It becomes active only after the Mi Account is linked.
• 🔹 Security policies – if the phone was issued by the organization (working, educational), the administrator could restrict access.
• 🔹 Incompatible firmware – on some custom assemblies (for example, ported from other models), some options may not work.

Dangerous settings: what not to touch without need

Not all options in developer mode are harmless. Some may:

• 🔥 Lead to data loss (e.g., Do not save actions for system applications).
• 🔋 Significantly increase battery consumption (Do not turn off the screen, Secondary Display Simulation).
• 🐌 Slow down the phone (incorrect settings) GPU-rendering or background processes).
• 🚨 Disruption of network operation (change of mobile data or Wi-Fi settings).

List of settings that are not recommended to change without a clear understanding:

⚠️ Attention: if you accidentally change the critical setting and the phone starts to work unstable, return everything to the default values.

How to turn off developer mode on Redmi Note 9

If you no longer need these settings or want to hide them from outsiders, there are two ways to turn off the mode:

Method 1: Through settings

1. Go to Settings. → For developers.
2. At the top of the screen, find the Developer Options Switch (or Developer options in English firmware).
3. Turn it off, the section will disappear from the menu.

Method 2: Reset all settings

If the first method did not work (for example, after a system failure), reset:

1. Go to Settings → System → Resetting settings.
2. Select Reset all settings (not to be confused with Reset to factory – it will delete all data!).
3. Confirm the action.

After the reboot, the Developer For section will disappear, but all user data (photos, apps, contacts) will remain in place.

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If you sell or transfer a phone to another person, it is recommended not only to turn off the developer mode, but also to perform a full factory reset, which will delete all associated accounts and personal data.

FAQ: Frequent questions about the developer mode on Redmi Note 9