How to turn on 4K on your Xiaomi TV: a detailed guide to checking compatibility

Xiaomi’s 4K Ultra HD (3840×2160) TVs are capable of delivering stunningly clear images, but not always that resolution is automatically activated. Users often find themselves in a situation where the screen shows Full HD (1080p) instead of the promised 4K, and there is no explicit switch in the settings, the reasons may lie in the wrong HDMI settings, outdated firmware, or even signal source limitations.

In this article, we’ll look at all the possible ways to turn on 4K on Xiaomi Mi TV 4/4A/4S/4X/4C, Redmi Smart TV and other models, from basic cable checks to hidden engineering settings. You’ll also learn how to determine whether your TV actually displays 4K, and what to do if the image remains blurry at the expense of all efforts.

1. Compatibility Check: Does your Xiaomi TV support 4K?

Before you try to turn on 4K, make sure your Xiaomi TV model is physically capable of reproducing that resolution. Not all devices, even those labeled "Smart TV," support Ultra HD.

Here's how to check:

• 📺 Models with 4K: Mi TV 4/4A/4S/4X (50"/55"/65"), Redmi Smart TV X50/X55/X65, Mi TV Q1/Q2, Mi TV P1. The title usually has a letter "4" or an indication of permission (for example, "4K HDR").
• 🔍 Where to see the model: Sticker on the back or in the Settings menu → On TV. → Model.
• ⚠️ Exceptions: Mi TV 4A 32" Redmi Smart TV 32" have permission to do everything 1366×768 (HD Ready).

If your TV is on the supported list but 4K is not included, the problem lies with settings or external devices. Xiaomi TVs with an Amlogic processor (such as the S905X) can require manual 4K activation through the engineering menu if the automatic determination does not work.

Verification HDMI-Port and cable: the main reason for the lack of 4K

Up to 80% of the problems with not having 4K on Xiaomi TV are related to the cable or HDMI port, and even if your TV supports Ultra HD, it won’t be able to display it if:

• 🔌 Used. HDMI 1.4 instead HDMI 2.0/2.1 (maximum 1.4 — 4K@30Hz).
• 📉 Cable damaged or too long (more than 3 meters without amplifier).
• 🖥️ The signal source (confix, computer, game console) does not support 4K.

How to check and correct:

1. Look at the cable: It should be labeled "High Speed HDMI" or "Premium Certified." If it doesn't, it's probably HDMI 1.4.
2. Connect to another port: Xiaomi TV usually has at least one HDMI 2.0 port (marked with a label or color).
3. Test the source: Connect the same cable to another device (like a 4K monitor) and if 4K is running, the TV settings are a problem.

Used. HDMI 2.0/2.1 cable|Cable connected to port HDMI 2.0 TV|cable length no longer 3 meters|The signal source supports 4K (for example, PS5, Xbox Series X, PC videocarded 4K)-->

⚠️ Note: Some consoles (for example, Xiaomi Mi Box S) display 4K Only when you have the option on in your settings. Go to Settings. → Display and sound → Permission and select 4K 60Hz.

3. Set up the resolution in the menu Xiaomi TV

If the cable and HDMI port are fine, the next step is to manually adjust the resolution, depending on the Xiaomi TV model, the path to settings may differ.

The standard method (for most models):

1. Open the settings (cog on the remote).
2. Go to Display and Sound → Screen Resolution.
3. Select 3840×2160 (4K) and confirm.
4. If you don’t have an option, go back to Display and Sound → Additional → HDMI Mode and install Enhanced.

For PatchWall models (Mi TV Q1/Q2, Redmi X50/X65):

• 📌 Press Menu. → Settings → Device and general → Display. → Permission.
• 📌 If 4K Unavailable, try resetting the settings HDMI: Settings → Device and general → Reset → Resetting settings HDMI.

On Xiaomi TVs with an Amlogic processor (e.g. Mi) TV 4A) activation may be required 4K To do this, press sequentially on the remote: Menu. → Up. → Up. → Down. → Down. → Left. → Right. → Left. → Right. → Up (code may vary depending on firmware).

4. Checking the signal source: console, PC or game console

Xiaomi TV can support 4K, but if the signal source (for example, the console or computer) is not configured correctly, you will still get Full HD.

If after all the manipulations 4K did not appear, try to force the mode through the graphics settings (for PC) or reset the signal source settings to factory.

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On game consoles (PS5, Xbox) after turning on 4K, HDR calibration may be required. Go to the screen settings and follow the instructions on the screen - this will improve color reproduction and contrast.

5. firmware update: why it matters for 4K

Outdated firmware is one of the most insidious reasons why Xiaomi TV doesn’t show 4K. The manufacturer regularly releases updates that fix high-resolution output errors, especially for models on Amlogic and MediaTek processors.

How to update firmware:

1. Open Settings → About TV → Update system.
2. Click Check for updates.
3. If a new version is available, install it (internet connection required).

If the automatic update does not work:

• 🔄 Reset to factory settings: Settings → On TV. → Reset (data will be deleted!).
• 💾 Manual firmware: Download the latest version from the official Xiaomi website (support section), write it down on a flash drive and update via Settings → Update → Local Update.

⚠️ Note: When you manually update your firmware, use only official files from mi.com. Third-party firmware may contain viruses or damage your TV. Also make sure the firmware model matches your TV (e.g. Mi Mi). TV 4A 55" and Mi" TV 4X 55" have different files!).

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After updating the firmware may need to reconfigure HDMI-Go to the port settings. → Display and sound → Regime. HDMI and select Improved to activate 4K.

6. Real resolution check: how to make sure 4K works

Many users think that if you have 4K in your settings, the TV actually shows it, but that's not always the case. Here's how to check that the image is displayed in Ultra HD:

Method 1: Test picture

• 🖼️ Download the test image to the flash drive 4K (permit 3840×2160).
• 📺 Connect the flash drive to the TV and open the file.
• 🔍 If the picture is clear, without pixelation — 4K If it's blurry, the TV scales Full. HD before 4K.

Method 2: Signal information

• 📊 On the Xiaomi remote, click the Info button (or Display on some models).
• 📊 The screen will show information about the current resolution (should be) 3840×2160@60Hz or 2160p).
• 📊 If he shows 1920×1080 — 4K non-active.

Method 3: Online Tests

• 🌐 Open your browser on your TV and go to YouTube. 4K Test.
• 🎥 Run the video in resolution 2160p. If it is played without lags and with high detail — 4K work.

If tests show that 4K is not active, go back to the previous sections and check the settings again.The problem may be limiting HDCP (content protection) - some sources (e.g. Netflix) require HDCP 2.2 to play 4K.

7. Additional settings: HDR, refresh rate and calibration

Turning on 4K is only half the story, and to make it look really impressive, you have to adjust the associated settings.

HDR (High Dynamic Range)

• 🌈 Included in Settings → Display and sound → HDR.
• 🌈 For HDR Compatible content is required (e.g. movies in the 4K HDR on Netflix or YouTube).
• 🌈 Some Xiaomi models HDR It only works when connected through HDMI 2.0a/2.1.

Update frequency (Hz)

• 🔄 Optimal value for 4K — 60 Hz (in the signal source settings).
• 🔄 Some Xiaomi TVs support 120Hz in 4K, but only in port HDMI 2.1 (e.g. Mi) TV Q2 75").

Colour calibration

• 🎨 Go to Settings. → Display and sound → Picture → Image mode and select Movie or Game.
• 🎨 Turn off Dynamic Contrast and Noise Reduction – They Degrade Quality 4K.

If the image becomes too dark after setting up the HDR, try increasing Brightness manually or turning on Local Dimming (if you have it in your model).

FAQ: Frequent 4K questions on Xiaomi TV