Xiaomi Mi 9T: What Wi-Fi does the smartphone support and how to set it up?

Xiaomi Mi 9T (also known as Redmi K20 (in some regions) is a popular mid-range smartphone released in 2019. Despite its age, the model remains relevant thanks to its balanced specifications and support for modern networks. However, many users are interested in one key question: What Wi-Fi module is installed in the Mi 9T?, what standards does it support and how to achieve maximum connection speed?

In this article, we will take a detailed look at the technical specifications of the wireless module. Mi 9T, let's compare it with current standards Wi-Fi 5 (802.11ac) And Wi-Fi 6 (802.11ax)We'll also provide practical recommendations for configuring your router for stable operation. We'll pay special attention to common issues, such as why a smartphone might "lose" the 5 GHz network or show low speeds despite a high-speed data plan.

If you are planning a purchase Mi 9T Whether you own a device in 2026 or already own one, this information will help you avoid common mistakes when setting up a home network and unlock the full potential of your device.

Xiaomi Mi 9T Wi-Fi Module Specifications

Smartphone Xiaomi Mi 9T equipped with a wireless module Qualcomm WCN3990, which is integrated into the chipset Snapdragon 730This module supports the following key standards and features:

• 📶 Wi-Fi 5 (802.11ac) — the main standard with a maximum theoretical speed of up to 867 Mbps at a frequency of 5 GHz.
• 🔄 Dual-band operation: network support 2.4 GHz (802.11n) and 5 GHz (802.11ac).
• 🔗 MU-MIMO — technology for simultaneous data transmission to several devices.
• 🔒 WPA3 — support for modern security protocol (subject to software updates).
• 📡 Bluetooth 5.0 — a separate module, but often mentioned together with Wi-Fi due to the common chip.

It is important to note that Mi 9T does not support Wi-Fi 6 (802.11ax), which appeared later. This means that the smartphone will not be able to take advantage of new routers with OFDMA, 1024-QAM and other improvements to the standard 802.11ax. However, for most home tasks (streaming video, gaming, downloading files) the capabilities Wi-Fi 5 more than enough.

The table below shows the key parameters of the Wi-Fi module in comparison with other popular smartphones of the same period:

The Mi 9T uses a single-band Wi-Fi module (1x1 MIMO), which limits its maximum speed to 867 Mbps on 5 GHz. For comparison, the flagship models of the same year (for example, Realme X2 Pro) had dual-band modules (2x2 MIMO) with speeds up to 1733 Mbps. This isn't critical for everyday tasks, but it can impact download speeds for large files under ideal conditions.

Supported frequencies: 2.4 GHz vs 5 GHz

Xiaomi Mi 9T It works on both main Wi-Fi frequencies, but there are fundamental differences between them that are worth considering when setting up a network:

• 🌐 2.4 GHz:
  • Larger coverage radius (better penetration through walls).
  • More interference from other devices (microwaves, Bluetooth, neighboring networks).
  • Maximum speed: up to 150–300 Mbps (depending on 802.11n standard).
• 🚀 5 GHz:
  • Less interference, more stable connection.
  • High speed (up to 867 Mbps For Mi 9T).
  • Shorter range (poor penetration through obstacles).

By default, many routers broadcast both networks simultaneously (with different names, for example, MyWiFi_2G And MyWiFi_5G). Mi 9T Automatically connects to a network with a stronger signal, but this isn't always optimal. For example, if you're far from the router, your smartphone may latch onto a weak 5 GHz signal instead of a stable 2.4 GHz, resulting in connection drops.

To manually select your preferred frequency:

1. Go to Settings → Wi-Fi.
2. Click on your network name and select Change network.
3. In the section Additionally (or IP settings) find the option Frequency range.
4. Select 2.4 GHz only or 5 GHz only (if available).

⚠️ Attention: Some firmware (for example, custom versions LineageOS) may not have the option to manually select a frequency. In this case, network priority is controlled at the router level.

Mi 9T's Maximum Wi-Fi Speed: Theory vs. Reality

Theoretical maximum speed Mi 9T at a frequency of 5 GHz is 867 Mbps (when using channel width 80 MHz and modulation 256-QAM). However, in real conditions this figure rarely exceeds 300–500 Mbps for the following reasons:

• 📉 Interference: neighboring networks, household appliances, thick walls.
• 🔌 Router limitations: Not all models support 80 MHz channel width.
• 📱 Smartphone firmware: Older versions of MIUI may artificially limit speed.
• 🌍 Provider tariff: If your internet tariff is below 100 Mbps, the difference between 2.4 and 5 GHz will not be noticeable.

To check your actual connection speed:

1. Install the application Speedtest by Ookla or WiFi Analyzer.
2. Connect to a 5GHz network and run a speed test.
3. Compare results with a 2.4GHz connection.

Typical results for Mi 9T at home:

• 📶 5 GHz (80 MHz): 400–500 Mbps (near the router).
• 📶 5 GHz (40 MHz): 200–300 Mbps.
• 📶 2.4 GHz: 50–150 Mbps.

⚠️ Attention: If the speed on 5 GHz is below 100 Mbps, check your router settings. The channel width may be set to 20 MHz instead of 40/80 MHz, or legacy compatibility mode is enabled.

How to check the channel width on a router?

To find out your current channel width, go to your router's web interface (usually at 192.168.0.1 or 192.168.1.1) and find the section Wireless Settings or Wi-Fi settings. Parameter Channel Width must be installed on Auto, 40 MHz or 80 MHz for maximum speed. If only available 20 MHz, update your router firmware or change the channel to a less busy one (for example, from 36 to 48).

Optimal router settings for the Xiaomi Mi 9T

To unlock the full potential of the Wi-Fi module Mi 9T, we recommend the following router settings:

If your router supports Wi-Fi 6 (802.11ax), but the network only has devices with Wi-Fi 5 (How Mi 9T), enable compatibility mode 802.11ax/acThis will allow new devices to take advantage of Wi-Fi 6, and the old ones - to work in standard mode.

To check the current connection settings on your smartphone:

1. Install the application WiFi Analyzer (for example, from VREM Software).
2. Open the tab Connection or Connection.
3. View parameters Link Speed (connection speed), Channel Width (channel width) and Signal Strength (signal level).

Update your router firmware to the latest version

Set 5 GHz channel width to 80 MHz

Select a channel with minimal interference (use WiFi Analyzer)

Disable Wi-Fi power saving mode in your smartphone's settings.

Reboot your router and smartphone after making changes-->

Common Wi-Fi issues on the Mi 9T and their solutions

Users Xiaomi Mi 9T often encounter the following problems when connecting to Wi-Fi:

• 🔌 The smartphone does not connect to 5 GHz.:
  • Check if the 5 GHz network is enabled on your router (sometimes it is disabled by default).
  • Make sure the network name (SSID) for 2.4 and 5 GHz is different.
  • Update your smartphone's firmware (older versions of MIUI had bugs with 5 GHz).
• 📉 Slow speed on 5 GHz:
  • Check the channel width (should be 40 MHz or 80 MHz).
  • Make sure there are no sources of interference nearby (other routers, microwaves).
  • Try changing the channel to a less busy one (for example, from 36 to 149).
• 🔄 Constant connection breaks:
  • Disable the feature Smart Connect (auto switching between ranges) on the router.
  • Disable the option in your smartphone settings. Automatic connection to open networks.
  • Reset network settings: Settings → System → Reset → Reset Wi-Fi settings.
• 🔒 Wi-Fi connects, but the internet doesn't work.:
  • Check your IP settings: set DHCP instead of a static IP.
  • Restart your router and smartphone.
  • Disable VPN or proxy if used.

If the problem persists, try reset network settings on smartphone:

Settings → System → Advanced → Reset settings → Reset Wi-Fi, mobile network, and Bluetooth settings

⚠️ Attention: On some firmwares (for example, global MIUI 12+) there is a bug due to which Mi 9T may lose connection to 5 GHz after sleep. Solution: Disable this feature. Wi-Fi optimization in the battery settings or install custom firmware (for example, Pixel Experience).

Comparison with other Xiaomi smartphones: which has better Wi-Fi?

For the sake of objectivity, let's compare Mi 9T with other popular models Xiaomi by Wi-Fi parameters:

As can be seen from the table, Mi 9T is not inferior to newer models of the budget and mid-range segments (for example, Redmi Note 10 Pro or POCO X3 Pro), since they all use single-band modules Wi-Fi 5However, flagship devices (for example, Xiaomi 11T) have already switched to Wi-Fi 6 with a dual-band antenna (2x2 MIMO), which provides a speed increase of up to 30–40%.

If you are looking for maximum Wi-Fi speed, consider models with Snapdragon 8xx or Dimensity (For example, POCO F3 or Redmi K40), which support Wi-Fi 6. However, for most tasks (watching videos, social networks, games) the capabilities Mi 9T more than enough.

Conclusion: Is the Mi 9T worth buying in 2026-2026 for Wi-Fi?

Xiaomi Mi 9T remains a relevant choice for those looking for a balanced smartphone with a good Wi-Fi module. single-band Wi-Fi 5 module provides speed up to 500 Mbps in real-world conditions, which covers the needs of most users. However, there are a few nuances:

• ✅ Pros:
  • Stable operation at 5 GHz with correct router settings.
  • Support for modern security protocols (WPA3).
  • Low power consumption of the module compared to flagships.
• ❌ Cons:
  • Absence Wi-Fi 6 (but this is not critical for home use).
  • Speed ​​limitation due to single-band antenna (1x1 MIMO).
  • Possible bugs with 5 GHz on older versions of MIUI.

If you plan to use your smartphone for:

• 🎮 Online games (PUBG Mobile, Call of Duty) — Mi 9T it will do, but for minimal pings it is better to choose a model with Wi-Fi 6.
• 📺 Streaming video (YouTube, Netflix in 4K) - no problem.
• 📥 Downloading large files—the speed is limited by your provider's plan, not your smartphone.
• 🏠 Smart home (Wi-Fi control) - the module is reliable for constant connection.

Generally, Mi 9T — a great option for those who aren't chasing the latest technology but still want stable and fast Wi-Fi. If you need some reserve for the future, consider models with Wi-Fi 6 (For example, POCO X4 Pro or Redmi Note 12 Pro+).

FAQ: Frequently asked questions about Wi-Fi on the Xiaomi Mi 9T

❓ Is it possible to flash the Mi 9T to support Wi-Fi 6?

No, the smartphone hardware (module Qualcomm WCN3990) does not support Wi-Fi 6The firmware will not add this feature as it requires a different chip.

❓ Why does the Mi 9T connect to 2.4 GHz instead of 5 GHz?

This can happen for several reasons:

1. Weak 5 GHz signal (for example, you are far from the router).
2. It's enabled on the router. Smart Connect (auto switching between ranges).
3. Power saving mode for Wi-Fi is enabled in the smartphone settings.

Solution: Disable Smart Connect On your router or manually select the 5 GHz network in your smartphone settings.

❓ Which firmware is best for stable Wi-Fi on the Mi 9T?

Official global firmware MIUI Generally stable, but some users report bugs with 5 GHz. Alternatives:

• MIUI EU — optimized version without bloatware.
• Pixel Experience - pure Android with good Wi-Fi support.
• LineageOS — for experienced users, but may require manual configuration of the module.

Make a backup before flashing!

❓ How do I check what frequency my Mi 9T is connected to?

Install the application WiFi Analyzer or NetSpot. In the section Connection the frequency will be indicated (2.4 GHz or 5 GHz) and channel width. You can also view the list of connected devices in the router settings.

❓ Does the case affect Wi-Fi quality?

Yes, metal or thick cases can weaken the signal, especially if the Wi-Fi antenna is located at the top of the smartphone (like Mi 9T). Try removing the case and repeating the speed test. If the difference is significant, consider cases made of thin plastic or silicone.