Developer mode on Xiaomi Redmi 9S: how to turn on and what gives

Xiaomi Redmi 9S MIUI-based smartphones hide many useful features from ordinary users — they can only be activated through developer mode. This tool gives you access to fine-tuning the system, debugging over USB, changing animations and even overclocking the processor. But how to turn it on correctly so as not to harm the device?

Many people are afraid to activate this mode for fear of failures or loss of warranty. In fact, the mere fact of inclusion does not invalidate the Xiaomi warranty - problems can only occur if hidden parameters are changed incorrectly. In this article, we will discuss the safe activation method, explain the key functions of the mode and warn about possible risks. 9S, The process may be different from other brand devices.

If you want to speed up your smartphone, test apps or just curious, this is the guide for you. We have checked all the steps on the current version of MIUI 14 (Android 12) and took into account the features of the firmware for the Redmi 9S with different regional builds.

What is a developer mode and why it is needed

Developer Mode is a hidden part of Android settings designed to test and debug applications. On Xiaomi smartphones, it also allows you to manage proprietary MIUI features that are not available in the standard interface.

The regime's main capabilities:

• 🔧 Debugging by USB — Connection to a computer to work with ADB, installation of custom firmware or data recovery.
• ⚡ Accelerating animations – reducing the transition time between screens (good for older devices).
• 📱 Secondary display simulation – testing multitasking or working with external monitors.
• 🔒 Unlocking the bootloader is the first step to install custom recavers (TWRP) or firmware (LineageOS).
• 📊 Process monitoring – displaying the use CPU/GPU real-time.

On Redmi 9S, developer mode is particularly useful for: disabling background optimization MIUI, which aggressively closes applications, and setting restrictions for specific programs, such as preventing the system from killing Telegram or the navigator when folding.

But not all functions are equally safe. GPU-rendering or background processes can cause the battery to overheat or discharge quickly.

Preparing the smartphone before activation

Before you turn on the developer mode on Redmi 9S, follow a few mandatory steps to help avoid errors and data loss.

1. Check out the MIUI and Android version:

• Open the Settings. → The phone.
• Remember the MIUI and Android versions (e.g., MIUI 14.0.5 based on Android 12).
• If you have Android 10 or older, the activation process won’t change, but some features in developer mode may be different.

2. Make a backup copy of:

⚠️ Attention: Changing the settings in developer mode can lead to malfunctions in the application. → Additionally. → Backup and reset or with Mi Cloud.

3. make sure the stability of the system:

• Battery charge - at least 50%.
• Close all background applications.
• Connect to Wi-Fi (in case you need to download more data).

If your Redmi 9S was purchased in China or has global firmware with regional restrictions, some menu items may be called differently, in which case, use a search by settings (the magnifying glass icon in the upper right corner).

Step-by-step instruction: how to turn on the developer mode

The activation process on the Redmi 9S takes less than a minute, but requires precise steps to be executed, and an error at any stage will result in the mode not opening.

Step 1. Open your phone information:

1. Go to Settings (the gear icon on the desktop).
2. Scroll down and select About Phone.

Step 2. Find the assembly number:

• In the About Phone section, tap on the MIUI version 7 times in a row.
• After the third click, a pop-up will appear with the countdown: “There are 4 steps left to become a developer!”
• Keep pressing until you see the message: “You’ve become a developer!”

Step 3: Go back to the main settings menu:

• Press the Back button (arrow at the top of the screen).
• Now in the list of settings will appear a new item – Additional → For developers.

Step 4: Activate the mode:

• Go to For Developers.
• Turn on the switch at the top of the screen (a password or pattern lock may be required).

On some Redmi 9S firmware (e.g., European or Indian), the path to developer mode may look like Settings → System → Additional → For developers. If you don’t find an item, use the settings search (a magnifier at the top).

Main features of the developer mode on Redmi 9S

Once activated, you will have access to dozens of hidden settings, and we have selected the most useful ones for the Redmi 9S that do not require deep technical knowledge.

Interface acceleration:

2. Background process management:

• 🔄 Limitation of processes (for developers) → Background Limits – Set a Standard Limit if there is a slowdown.
• 🚫 Do not save actions (for developers) → Do not save actions – turn on so that applications do not save state after closing (saves memory).

Debugging and safety:

• 🔌 Debugging by USB — mandatory for work with ADB or Fastboot.
• 🔐 Unlocking OEM — It is necessary to install custom firmware (only turn on if necessary!).
• 📡 Fictitious locations – allows emulation GPS-coordinates (useful for games of the type) Pokémon GO).

💡

If the animation changes the interface twitch, return the values to 1x or restart the smartphone. On the Redmi 9S with a Helio G35 processor, too aggressive settings can cause lags.

What can be broken: risks and warnings

Developer mode is a powerful tool, but misuse can lead to serious problems. On Redmi 9S, it is especially dangerous to change the following settings:

Processor and GPU settings:

⚠️ Attention: Enable the option “Enforcement of use” GPU" or changing the "Background Process Limit" to "No Background Processes" may cause: Helio processor overheating G35 (maximum temperature - 95°Instant battery discharge (up to 20% per hour standby) System departure to bootloop (cyclical restart).

Network settings:

• 📶 Changing the parameters of the mobile network (for example, forced selection) 4G/LTE) It may cause loss of communication.
• 🌐 Enabling “Aggressive Wi-Fi switching to mobile data” will increase traffic consumption.

Safety:

• 🔓 Disconnection of "Protections" MIUI" App Checks” will make your device vulnerable to viruses.
• 🔑 Activation of "Unlocking" OEM" Unnecessarily increases the risk of data theft when you lose your phone.

If after the changes, the smartphone began to slow down or overheat, return all parameters to the default values (the button “Reset settings” in the menu For developers) or reset through Settings → Additional → Backup and Reset.

💡

On Redmi 9S, the most secure features of the developer mode are animation acceleration and USB debugging. Avoid changes related to the processor, memory and network, if you are not sure of the consequences.

How to turn off the developer mode

If you no longer need hidden features or want to return the smartphone to factory settings, the developer mode can be deactivated. On the Redmi 9S, there are two ways:

Method 1. Through the settings menu:

1. Go to Settings → Additional → For developers.
2. At the top of the screen, turn off the Developer Mode switch.
3. Confirm the action if a request appears.

Method 2. Complete reset (if the mode is not turned off):

⚠️ Warning: This method will delete all data from the device! Use it only if the first method didn't work.

1. Go to Settings → Additional → Backup and Reset.
2. Select "Settings Reset."
3. Confirm the action and wait for the reboot.

Once you disable the developer mode, all the options you changed will reset to the default values. The "Developers" option will disappear from the settings menu, but it can always be returned by repeating the activation procedure (7 taps on the MIUI version).

Frequent questions about the developer mode on Redmi 9S