How to speed up the Xiaomi 4A router: proven methods for stable Wi-Fi

Xiaomi Router 4A is one of the most popular budget routers, but over time even it begins to slow down: pages load longer, video hangs, and online games are laid. The reasons can be rooted in both device settings and external factors, from the congestion of the network of neighbors to outdated firmware. In this article, we will discuss 10 practical ways to speed up the router without buying a new one.

It’s important to understand that the Xiaomi 4A (including the 4A Gigabit and 4A 100M modifications) has hardware limitations, such as single-threaded Wi-Fi at 2.4GHz. This means that the theoretical maximum speed is ~300Mbps, but in practice the value is often lower. However, even within this framework, you can squeeze more by setting the device correctly.

We tested all methods on the MiWiFi R4A firmware versions 2.28.15 and 3.0.36 (including international builds), and the results vary depending on the provider’s tariff and the number of connected devices, but on average, we managed to increase the speed by 20-40%.

1. Optimization of Wi-Fi channel: how to avoid interference

The main reason for slow Wi-Fi on Xiaomi 4A is congestion. In apartment buildings, dozens of routers broadcast on the same channel (usually the 6th or 11th), causing interference, the solution is to choose the least loaded channel manually.

To analyze the airwaves, use applications like Wi-Fi Analyzer (Android) or NetSpot (Windows/macOS) to show which channels are free. The optimal options for 2.4 GHz are 1, 5, 9 or 13 (allowed in Russia), channels 12 and 13 are often empty, because many routers do not use them by default.

How to change the channel to Xiaomi 4A:

1. Open the router’s web interface at 192.168.31.1 (the username and password are usually admin).
2. Go to Settings → Wi-Fi → Basic settings.
3. In the Channel field, select free (e.g. 13).
4. Save the settings and restart the router.

⚠️ Warning: If you drop your speed after you change the channel, go back to the previous one. Some devices (like older smartphones) don't work well on channels 12-14.

Change of Wi-Fi mode: 802.11n vs 802.11b/g/n

By default, Xiaomi 4A runs in 802.11b/g/n mode for compatibility with older devices. However, this mode limits speeds to 54 Mbps for devices that only support 802.11g. If all your gadgets are modern (released after 2012), you can forced to switch to 802.11n.

Instructions:

1. In the router’s web interface, go to Settings → Wi-Fi → Additional settings.
2. Find Wi-Fi Mode and select 802.11n only.
3. Channel Width set to 20/40 MHz (this will increase throughput).
4. Save and restart the router.

Check the speed on your devices after the change. If some devices stop connecting, return 802.11b/g/n mode.

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If you have 5GHz devices (like the Xiaomi Router 4A Gigabit), connect them to this network – it’s less loaded and faster.

3. firmware update: why it's critical

Router firmware affects stability and speed. Older versions of Xiaomi 4A software had bugs that caused speeds to drop by up to 50% with a large number of connected devices. For example, firmware 2.28.13 found a memory leak that caused the router to “hang” after 3-4 days of continuous operation.

How to update firmware:

• 🔄 Automatically: In the web interface, go to Update → Check for updates. If a new version is available, click Update.
• 📥 Manual: Download the latest firmware from the official Xiaomi website (choose a model) R4A). In the router web interface in the Update section, download the.bin file.

⚠️ Warning: When manually updating, do not turn off the router and do not interrupt the process! If the power indicator flashes red for longer than 5 minutes, then an error has occurred - you need to restore through the system. TFTP.

4.QoS setup: a priority for important devices

Quality of Service (QoS) allows you to distribute traffic so that critical devices (such as a smart TV or a game console) get more bandwidth. On Xiaomi 4A, this feature works more simplified, but even its basic settings work.

How to set up QoS:

1. In the web interface, go to Additional settings → QoS.
2. Enable the function and select Po mode MAC-address.
3. Add devices that need priority (find their MACs in the list of connected customers).
4. Set a speed limit for background devices (for example, for smart lamps or for lights). IP-camera).

Example of distribution:

- High priority: Smart TV (4K-streaming), PC (online games).

- Medium: Smartphones, tablets.

Low: Smart speakers, security cameras.

Enable QoS in additional settings|Add MAC-address of priority devices|Limit speed for background gadgets|Save and restart the router-->

5. Disabling unnecessary functions: what slows down the router

Xiaomi 4A has limited hardware resources: MT7628AN (580 MHz) processor and 64 MB of RAM. Each feature on it takes away some of these resources, which leads to slow traffic processing.

• 🔌 Guest Network: If not used, disable in Settings → Wi-Fi → Guest network.
• 📡 WPS: Vulnerable feature that is better deactivated in Additional settings → WPS.
• 🔄 IPv6: If your provider does not support IPv6, Put him on the grid. → IPv6.
• 📊 Traffic statistics: Constant monitoring loads the processor. Disabled in Additional settings → Statistics.

Critical information: On firmware older than 2.28.10, Parental Control can cause a router to hang over a large number of rules (more than 5). If you notice a lag, turn it off or update the firmware.

6. factory reset: when nothing helps

If the router started to slow down after a lot of setting changes or a long time without rebooting, hard reset will help. This will remove all user settings, including Wi-Fi passwords, but return the device to a “clean” state.

How to reset Xiaomi 4A:

1. Press and hold the Reset button (on the back) for 10 seconds (until the indicator flashes yellow quickly).
2. Release the button and wait for the reboot (2-3 minutes).
3. Connect to the network. Xiaomi_XXXX (without password and reset the router through 192.168.31.1.

⚠️ Warning: Once reset, the router will return to the firmware that was installed at the time of purchase. If you were updating the software, you will have to repeat the process manually!

7. Alternative firmware: when standard software fails

If all methods have been tried, but the speed remains low, consider installing custom firmware. Xiaomi 4A is popular:

• 🐧 OpenWRT: Lightweight firmware with advanced QoS settings and support VPN. Requires technical knowledge.
• 🔧 Padavan: Optimized for routers on Mediatek chips (as in the 4A). Simplifies the setup.
• 📦 Breed Bootloader: Allows you to install any firmware, but the risk of “bricking” the router is higher.

Warnings before firmware:

• Xiaomi’s warranty will be cancelled.
• Incorrect firmware can turn a router into a “brick”.
• Some features (such as cloud management via Mi Home) will no longer work.

If you decide, follow the instructions on the 4PDA or OpenWRT Wiki forums. For Xiaomi 4A, the current builds are:

OpenWRT 23.05.0 (stable)

Padavan RT-N56U (modification for MT7628)

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Custom firmware is only justified if you are confident in your skills, and for most users, optimizing standard software is enough.

8 Hardware Improvements: When Software Methods Don't Help

If the router is physically worn out (for example, overheats or has damaged ports), the software settings will not save.

• 🔥 Overheating: Xiaomi 4A It warms up when you're under a lot of pressure, and make sure the air vents are not closed, and the router is vertical.
• 🔌 Power Cable: Use the original power supply (5V/1A). Cheap analogues can cause voltage drawdowns.
• 📡 If the signal is weak, try replacing the regular antennas with more powerful ones (with a connector). RP-SMA).

If the router is older than 3-4 years and even after all the manipulations, the speed does not exceed 50 Mbps, it may be time to think about replacing. Modern models (for example, Xiaomi Router 4C or Redmi Router AX5) support Wi-Fi 6 and dual-band, which gives a speed increase of 3-5 times.

FAQ: Frequent questions about the acceleration of Xiaomi 4A