How to increase screen hertz on Xiaomi Redmi 9T: from 60 Hz to 90 Hz without risk

Xiaomi Redmi 9T is a budget smartphone with decent specs, but with a factory refresh rate of 60 Hz. Meanwhile, its hardware platform (Qualcomm Snapdragon 662) theoretically supports 90 Hz, and in some regions, this option is even hidden. In this guide, we will discuss how to safely unlock high hertz, what tools you will need and what to do if after changes there are problems with the display.

It's important to understand that the boost in hertz is an informal modification that can lead to overheating, accelerated battery discharge or artifacts on the screen. The manufacturer has limited the frequency for a reason: the Redmi 9T does not have adaptive AdaptiveSync technology, which means that 90 Hz will work constantly, loading the processor. Before you start, assess whether you are ready to compromise for the sake of smooth interface.

Why isn’t the Redmi 9T 90Hz default?

Xiaomi has not officially announced 90Hz support for the Redmi 9T, although the hardware allows it.

• 🔋 Energy consumption: 90 Hz increases battery load by 15-20%, which is critical for the budget segment.
• ⚙️ Lack of optimization: screen drivers and GPU not tested at high frequencies, which can cause lags in games or applications.
• 🌍 Regional firmware: In some countries (e.g. India) the 90Hz option is on the menu, but hidden for Europe and Russia.
• 📱 Xiaomi Reserves High Frequency for Higher Priced Models (POCO X3, Redmi Note 10 Pro).

Interestingly, the Redmi 9T uses the same JDI LTPS display module as the POCO M3 — and there’s 90 Hz available out of the box. This confirms that the restriction is artificial. However, before overclocking, consider that on some batches of smartphones (especially the early revisions of 2021), the forced turn on of 90 Hz leads to a flicker of the screen due to an unstable controller.

Preparing for a change in hertzovka: what to do in advance

Before you increase the frequency of the update, follow the mandatory steps:

1. Back up your data via Settings → System → Backup or Mi PC Suite, which will save your data if the system starts to run unstable after the changes.
2. Check out the MIUI version: the 90Hz option works best on MIUI 12.5+ firmware. Outdated versions may not support the ADB command.
3. Charge the phone at least 50% - when overclocking, the battery discharges faster, and interruption of the process is fraught with failures.
4. Install ADB drivers on your PC (download from the official Android Developers website) and enable USB debugging in the developer settings.

Check out the MIUI version (12.5 or later)

Make a backup with Mi PC Suite

Charge your phone ≥50%

Install ADB-PC drivers

Enable debugging by USB in the developer settings-->

If you’ve never used ADB (Android Debug Bridge), don’t worry: it’s a standard PC-smartphone communication tool that even service centers use. The main thing is to follow the instructions and not enter random commands. For convenience, download the ready-made Platform Tools package from Google and unpack it to the root of the C:\ drive.

Yes, on another phone | Yes, but no success | No, this is my first time | I don't know what ADB-->

Method 1: Enable 90 Hz via ADB (no root rights)

The safest method is to use the ADB command to unlock the hidden option, which requires no root access and is reversible: when you reset your settings or update your firmware, the hertz will return to the factory 60 Hz.

Step-by-step:

1. Get Redmi on board. 9T PC-only USB-cable (preferably original).
2. Open the command line (Win + R → enter cmd) and go to the folder with platform-tools: cd C:\platform-tools
3. Check the device connection: Adb devices should show your phone’s serial number.
4. Enter the command to unlock. 90 Hz: adb shell settings put global peak_refresh_rate 90
5. Reboot your phone. Once turned on, go to Settings → Display → Screen refresh rate – there should be a 90Hz option.

If you don’t have an option, try an alternative command:

adb shell settings put global oneplus_screen_refresh_rate 1

(Yes, it works for Xiaomi, despite the name.)

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If the ADB gives a "device unauthorized" error after you enter the command, check that a window appears on the phone when you connect, requesting debugging permission, sometimes hiding behind other notifications.

Method 2: Manual editing of build.prop file (for advanced)

This method requires root rights and is designed for users who already have experience with system files, and allows not only to enable 90 Hz, but also to fix them as the default value.

Warning: Incorrect editing build.prop can lead to bootloop (locked phone turn on).If you are not sure about your actions, use the method with ADB.

⚠️ Warning: Before you edit build.prop, make sure you back it up. To do that, copy it to your PC or to the cloud. If the phone doesn't boot up after the changes, you'll have to refashion it through Fastboot.

Instructions:

1. Install a file manager with root support (such as Root Explorer or Solid Explorer).
2. Go to /system/build.prop and open the file in the text editor.
3. Add a line to the end of the file: persist.vendor.sys.ui_hw_refresh_rate=90 ro.vendor.display.refresh_rate=90
4. Save the changes, restart the phone.

After rebooting, check the hertz through the CPU-Z or DevCheck app. If the screen starts to flicker or artifacts appear, return the original file settings.

Problems after increasing hertzovka and their solutions

Even if you successfully switched on 90 Hz, there may be side effects, and let's look at the most common and ways to eliminate them:

If the phone starts to overheat after turning on 90Hz, check the processor boot in AIDA64. If the temperature exceeds 50°C in idle, it is better to return to standard settings. Also pay attention to automatic regulation of the hertz: in some MIUI firmwares, the AdaptiveSync option turns on itself, resetting the frequency to 60Hz when the battery is low.

Alternative ways to improve smoothness without overclocking

If the risks of overclocking the hertzovka scare you, but you want a more responsive interface, try these methods:

• ⚡ Turn on the animation. 0.5x: Go to Developer Settings and set: The scale of the window animation = 0.5x Scale of transition animation = 0.5x The duration of the animator = 0.5x This will visually speed up the system’s response.
• 🔄 Use lightweight launchers: Nova Launcher or Lawnchair optimized better than standard launchers MIUI Launcher.
• 🎮 Activate the game mode: in Settings → Special facilities → Game turbo mode enable the option Improved performance.
• 🔋 Limit background processes: in the developer settings, reduce the limit of background processes to 2-3.

These methods won't replace 90Hz, but they will make the phone more comfortable without risking the system, and the effect of reducing animation is particularly noticeable, as the interface begins to respond to touch almost instantly.

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Before experimenting with hertz, check if your version of Redmi 9T supports 90Hz. To do this, install the DevCheck app and see the Max Refresh Rate option in the Display section. If it says 60 Hz, overclocking may not work.

Should I raise the hertzka on Redmi 9T: the final verdict

To sum up: the increase in hertz from 60 to 90 Hz on Xiaomi Redmi 9T is possible, but has a number of limitations:

• ✅ Pros: More smooth scrolling and animations. better gaming experience (if) GPU It's a high frequency experience. It's a premium experience.
• ❌ Cons: Increased battery consumption (15-25%), CPU overheating and trottling risk, possible on-screen artifacts (flickering, stripes) Reset after update MIUI.

Our verdict is that if you're a player or enthusiast who's willing to sacrifice battery life for smoothness, try it. For everyday tasks (social media, instant messengers, video), the comfort gains will be minimal, and the risks outweigh the benefits. Alternatively, wait for custom firmware (like Pixel Experience), where 90Hz is already optimized.

⚠️ Note: if you sell or rent a phone to the service, be sure to return the factory 60 Hz. Otherwise, new owners or craftsmen may consider the malfunction as a consequence of your actions, which will void the warranty.

FAQ: Frequent questions about overclocking the hertzovka on the Redmi 9T