Xiaomi Mi 9T Pro: screen frequency – how many hertz and how to change it

Xiaomi Mi 9T Pro (also known as Redmi K20 Pro in some regions) is still a popular choice among users who value the balance of performance and price. However, many owners are wondering how much hertz the Mi 9T Pro screen has and whether it is possible to increase the refresh rate for a smoother picture? In this article, we will discuss the technical characteristics of the display, how to check the current frequency, and the possibility of changing it – both official and informal methods.

It's important to understand that screen refresh rates (measured in hertz, Hz) directly affect the smoothness of the content display. The higher the value, the more comfortable the interface is, especially in games or when scrolling through web pages. But not all smartphones support dynamic frequency change, and the Mi 9T Pro is no exception. Next, you will learn what limitations the hardware and firmware imposes, and how to get around them without risk to the device.

Technical characteristics of the screen Xiaomi Mi 9T Pro

Smartphone Xiaomi Mi 9T Pro is equipped AMOLED-diagonally 6.39 resolution 2340 × 1080 pixels (Full) HD+). The manufacturer states the following key parameters:

• 🔹 Type of matrix: Super AMOLED (Samsung E3)
• 🔹 Brightness: up to 600 nits (peak - up to 800 nits in mode) HDR)
• 🔹 Contrast: dynamic, typical of the AMOLED (practically)
• 🔹 Support HDR: HDR10
• 🔹 Protection: Gorilla Glass 5

But the update rate is ambiguous. Officially, the Mi 9T Pro supports the standard 60 Hz. However, there are claims on the network that some firmware (especially custom ones) allow you to unlock 90 Hz or even 120 Hz. Is this really true? We will discuss below.

It is worth noting that AMOLED-matrixes are theoretically capable of operating at high frequencies, but the limitation is imposed by the processor (in this case, the Snapdragon 855) and the display drivers. Moreover, increasing Hz leads to increased power consumption, which is critical for a battery with a capacity of 4000 mAh.

How many hertz does the Mi 9T Pro screen have out of the box?

The official screen refresh rate of Xiaomi Mi 9T Pro is 60 Hz. This value is fixed in the stock firmware MIUI (any version) and cannot be changed through standard settings. Even in the developer menu (Settings → About Phone → MIUI version, then tap 7 times on the item) option Minimum width or animation does not affect Hz.

To make sure of this yourself, you can use special applications for display testing:

• 📱 Display Tester (shows current frequency and supported modes)
• 📱 CPU-Z (Device" tab" → "Display")
• 📱 AndroSensor (monitoring hardware parameters)

The apps will definitely show 60.00Hz on stock firmware, but some users claim that after installing custom ROMs (like LineageOS or Pixel Experience), 90Hz was activated.

⚠️ Note: Frequency testing applications may show incorrect data on some firmware. ADB-Check the commands or check through the engineering menu (#4636##).

Can the screen be increased to 90 or 120 Hz?

Theoretically, yes, but with serious reservations, the fact that the hardware Mi 9T Pro (in particular, the display controller) is not optimized for operating at frequencies above 60 Hz.

1. Custom firmware. Some LineageOS or AOSP builds contain patches to unlock 90Hz. However, this requires unlocking the bootloader and losing warranty.
2. Modified cores: Custom core firmware (e.g., FrancoKernel) can add dynamic frequency support, but the risk of a device blinking is high.
3. ADB-through the teams. ADB You can try to force the frequency, but it doesn’t work on all versions. MIUI:

adb shell settings put global peak_refresh_rate 90


adb shell settings put global min_refresh_rate 90

In practice, even if you can activate 90 Hz, it will lead to:

• 🔋 Increased battery consumption (15-25% faster discharge)
• 🔥 Overheating of the processor (especially in games)
• 🐞 Image artifacts (flickering, frame breaks)

💡

Before experimenting with firmware, make a full backup via TWRP or Mi Flash Tool. This will help restore the phone in the event of a crash.

How to Check the Real Screen Frequency

If you doubt the readings of the applications or want to make sure that custom firmware has indeed activated 90 Hz, use one of the reliable methods:

1. via ADB (for advanced users)

Connect your phone to your PC, activate USB Debugging in the developer settings and execute the command:

adb shell dumpsys display

In the conclusion, find the refresh rate line, which will show the current frequency.

DisplayDeviceInfo{mDisplayId=0, ... refreshRate=90.0, ...}

2.Using the engineering menu

Enter the code ##4636## in the phone app, then go to the Hardware testing → Display tab, and you can see the current display settings, including Hz.

3. Visual test

Take a scroll-mode Mi 9T Pro on another phone’s camera (like flipping through Twitter feeds). At 60Hz, strings will shake, and at 90Hz, smoother movement will be noticeable.

⚠️ Note: Some custom firmware may show in 90Hz settings, but it is realistic to work at 60Hz. ADB test-utilities.

Frequency comparison: 60 Hz vs 90 Hz vs 120 Hz

To understand whether to chase an increased frequency, consider the differences in practice:

Note: Even if the screen supports 90Hz, games rarely squeeze more than 60 FPS on the Snapdragon 855 due to GPU limitations.

For most tasks (social networks, videos, instant messengers), 60 Hz is more than enough. 90 Hz only makes sense for gamers or those who work with animations a lot. And 120 Hz on the Mi 9T Pro is a myth: iron simply won’t pull such a load without critical overheating.

💡

Raising the screen frequency above 60Hz on the Mi 9T Pro is only possible through custom firmware, but this reduces stability and increases battery wear.

How to optimize screen performance without changing Hz

If you are not ready to risk firmware, but want to improve the responsiveness of the display, use these tips:

Activate the "No Delay" mode in the developer settings (Settings → Additional → For Developers → Animation = Off.)

Enable the option "Improved response" in Settings → Display → More

Disable adaptive brightness (fixed value reduces the load on the processor)

Use dark themes (AMOLED saves charge on black background)

Update the firmware to the latest version MIUI (fixing bugs with display)-->

Another effective way is to turn off unnecessary animations.

1. Activate Developer Mode (7 taps according to MIUI).
2. Go to Settings → Additional → For developers.
3. Set all three animation parameters (Windows Animation Scale, Transition Animation Scale, Animator Duration Scale) on Off or 0.5x.

These manipulations will not change the physical frequency of the screen, but subjectively the interface will become “faster” by reducing latency.

Frequent Mi 9T Pro screen problems and their solutions

Mi 9T Pro users sometimes experience display problems related to both hardware and software.

• 🔄 Screen flickering, most often caused by incompatible firmware or by a plume damage, solution: reset to factory settings or reflash the device.
• 🖥️ Artifacts (stripes, dots) may appear after falling or getting moisture. Diagnostics: check through a YouTube test video (e.g., "dead pixel test").
• 🔋 Spontaneous brightness change. The culprit is the light sensor. Turn off adaptive brightness in Settings. → Display.
• 🎮 Games hangings, overheating, set limits FPS Use the Game Turbo or use the cooler.

To diagnose hardware problems, use the hidden test menu:

##28346##

Here you can check the operation of the touchscreen, color reproduction and other display parameters.

FAQ: Frequently Asked Questions