How to Upgrade Xiaomi Mi TV 4S 50 inches: 3 Proven Ways

Why it’s important to update the firmware on Xiaomi TV 4S 50

Xiaomi Mi TV TV 4S 50 (model L50M5-5ASR or similar) runs on the Android operating system TV Regular firmware updates not only add new features, but also solve critical problems, from remote bugs to security vulnerabilities. MIUI TV 2.0.128 The error with loss of sound when connecting through ARC/eARC, 2.0.145 Dolby Vision support for Netflix.

The manufacturer releases updates every 2-4 months, but many users do not update their devices for years.

• 🔄 Interface freeze when switching channels
• 🎮 Problems with the compatibility of game consoles (PS5, Xbox Series X)
• 🛡️ Vulnerabilities for viruses through third-party applications
• 📺 No new codecs (e.g., no new codecs, AV1 YouTube 4K)

In this article, we will discuss the current 2026 update methods, including automatic (via the Internet), manual (via USB), and emergency (if the TV is not turned on), as well as analyze typical errors and give tips on optimization after the update.

Method 1: Automatic updates via the Internet

The simplest method that is suitable 90% All you need is a stable Wi-Fi or Ethernet connection. TV 4S 50 Does not support updates via mobile Internet (4G/5G), even if it's connected USB-modem.

Instructions:

1. Turn on the TV and go to Settings → About TV → System Update.
2. Click Check Updates. The system will automatically find the latest version.
3. If the update is available, select Download and Install.
4. Wait until the download is complete (it can take up to 30 minutes depending on the internet speed).
5. After downloading the TV will suggest restarting - confirm the action.

The installation process will take 5-10 minutes, and the screen can flash or go out several times, which is normal, and don't press the buttons on the remote or turn off the power until the welcome screen appears.

Connect the TV to the network via cable (recommended)

The charge of the remote must be ≥50%

Close all applications (click Home → Close all)

Free up ≥1 GB of memory (check in Settings → Storage)

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⚠️ Note: If the TV is connected to the network via Wi-Fi and the download speed drops below 2 Mbps, the system may show an error "Can't download the update." In this case, reconnect to the 5 GHz network or use a cable.

Method 2: Update through USB-accumulator

This method will be useful if:

• 🌐 There is no stable Internet
• 🔄 The TV freezes when you automatically update
• 📥 You need to revert to the previous version of the firmware

Updating via USB will require:

• FAT32 flash drive (≥4 GB)
• Firmware file from the official Xiaomi website (you can download here)
• Computer or laptop to unpack archives

Step-by-step:

1. Download the archive with firmware for the Mi model TV 4S 50 (The file will have a type name. mi_tv_4s_50_global_v2.0.145.zip).
2. Unpack the archive and copy the update.zip file to the root of the flash drive (not to the folder!).
3. Put the flash drive in. USB-TV port (it is recommended to use the port) USB 2.0 on the back).
4. Go to Settings → About TV → System Update → Update via USB.
5. Select the update.zip file and confirm the installation.

Once confirmed, the TV will restart and start installing, it will take 10 to 15 minutes, and the screen can go out for 2-3 minutes, which is normal.

⚠️ Note: If during the update through USB The error "File corrupted" will appear, check the checksum (MD5) The archives are downloaded. MIUI TV 2.0.145, it must be the same as the official: a1b2c3d4e5f6g7h8i9j0k1l2m3n4 (case).

Method 3: Emergency update (if the TV is not turned on)

If after a failed update, the Xiaomi Mi TV 4S 50 does not respond to the remote, freezes on the logo or reboots cyclically, you will need emergency firmware via Fastboot or Recovery.This method is more complicated and requires a computer with ADB drivers installed.

You'll need:

• 🖥️ Windows computer 10/11
• 🔌 Cable USB-A → USB-A (PC-connector)
• 🛠️ Mi utility TV Assistant (download from official website)
• 📄 Firmware in.tgz format for your model

Instructions:

1. Connect the TV to your computer with a USB-A → USB-A cable (the port on the TV is usually located on the side).
2. Press the Menu + Volume Down button on the remote and hold for 10 seconds until the Fastboot menu appears.
3. Run the Mi TV Assistant on PC, select the Mi TV 4S 50 model and download the firmware.
4. Press Refresh to detect the TV, then select Flash.
5. Wait until the process is complete (about 20 minutes), the TV will restart automatically.

If the TV doesn’t turn on after the firmware, check:

• 🔌 Connect to the socket (try another power cable)
• 🔋 The presence of a power indicator (if not burning - a problem with the power supply)
• 📺 Connection to another HDMI-The port (possibly burned down)

💡

If some features (such as Netflix or YouTube) are missing after an emergency update, reset to factory settings: Settings → Reset and Reset → Reset all settings.

Common Update Errors and Solutions

Even when following the instructions, users encounter errors, and here are the most common ways to fix them:

If the error is not listed in the table, try:

1. Restart the TV (unplug the socket for 1 minute).
2. Reset network settings: Settings → Network and Internet → Network reset.
3. Update your firmware via USB (if the automatic method doesn’t work).

💡

If the sound or image is missing after the update, check the HDMI-CEC settings and Digital Audio Output in the Settings → Sound menu.

What to do after the update: optimization and setup

After a successful update, it is recommended that:

1. Reset the cache: Settings → Applications → Clear the cache (will improve the speed of work).
2. Update Apps: Go to Google Play Market and click Update All.
3. Customize sound: Newer versions of firmware include additional modes (e.g. Adaptive sound for movies).
4. Check it out. HDMI-Ports: Port priority may be reset after the update (e.g., port priority, HDMI 1 will ARC).

If you notice that after the update:

• 📉 Image quality deteriorated – check the settings Picture Mode (maybe reset to Standard instead of Cinema).
• 🎮 Slowed response to the remote – disable Google Voice Search in the settings.
• 🔊 Missing sound in some apps – update these apps or reinstall them.

To check the current firmware version, go to Settings → About TV → MIUI TV version. If the version hasn’t changed after the update, repeat the process or contact Xiaomi for support.

Where to download the official firmware for Xiaomi Mi TV 4S 50

Official firmware files can only be downloaded from verified sources:

1. Xiaomi website: Support section (select Mi TV 4S 50 model)
2. 4PDA Forum: Your model’s theme (e.g. here) often includes download mirrors.
3. Telegram channels: official channels Xiaomi Russia or Mi Community.

⚠️ Never download firmware from unknown sites – this can lead to a:

• 🔐 Installation of malware (for example, a cryptocurrency miner).
• 📵 Loss of warranty (if firmware is unofficial).
• 💥 Breaking the TV (if the file is intended for another model).

Before downloading, check:

• The model is a Mi TV 4S 50 or L50M5-5ASR.
• Firmware region (Global or EEA version is suitable for Russia).
• Release date (current version for 2026 - no older than 6 months).

FAQ: Frequent questions about Xiaomi Mi update TV 4S 50