Xiaomi Mi Router 4A Gigabit: the complete guide

Modern routers from the Chinese giant often have excellent hardware for little money, but the software leaves much to be desired. VPN-They want to get the most out of gigabit ports, which is why the question is how to flash the Xiaomi router. 4A Gigabit Version remains one of the most popular among home internet enthusiasts.

The process of replacing a regular operating system with an alternative one, such as OpenWrt, Padavan or DD-WRT, opens up access to advanced traffic management functions, installing third-party packages and fine-tuning Wi-Fi. However, this action requires care and strict follow-up to instructions, since a mistake at any stage can turn the device into a useless piece of plastic.

In this article, we will discuss in detail the preparation of the equipment, the process of obtaining superuser rights and the actual installation of the new firmware. You will learn what tools you will need, how to avoid bricking and how to bring the device back to life in case of failure.

Preparation of equipment and choice of firmware

The first step is to identify your model. There are two versions of the Xiaomi 4A router on the market: the regular (100 Mbps) and the gigabit (Gigabit Edition). It is critical not to confuse them, since the firmware from one version will destroy the other. At the bottom of the device there should be a sticker where the name of the model indicates the word "Gigabit" or "AC1200".

Next, you need to choose the right operating system. For beginners switching from stock MIWiFi, Padavan is often recommended because of its simple interface, similar to the original one. More experienced users choose OpenWrt for its modularity and the ability to install Docker containers directly on the router.

For a successful procedure, you will need:

• 💻 Computer or laptop with a network port LAN (Wi-Fi for firmware is not recommended).
• 🔌 Ethernet Cable (patch cord) for connecting PC and router.
• 📥 Firmware file downloaded from a verified source (.bin format).
• 🔋 Stable power supply (make sure your laptop is charged).

Only download files from official repositories or developer forums, such as 4PDA or GitHub. Using modified builds from unknown authors can lead to malicious code being introduced into your network.

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Before starting the procedure, take a picture of the sticker on the bottom of the router and the current WAN settings (connection type, login and password provider) to quickly restore Internet access after flashing.

Unlocking SSH and obtaining superuser rights

The MIWiFi firmware block access to system files. To install third-party software, you need to activate the SSH protocol. There are several methods, but the most reliable for the Gigabit version is the use of a special exploit through a web interface or utilities for the PC.

One popular way to do this is to use a script that sends a special request to the activation server, and you'll need to download the archive of the utility, unpack it, and run the launch file, and in the process, the program will ask for a password from the router's admin panel.

The process is as follows:

1. Connect the router to the computer with a cable.
2. Run the unlock utility.
3. Enter the administrator password (which you set when you first set up).
4. Wait for the message of successful activation of Telnet/SSH.

Once activated successfully, you can connect to the router via the terminal. Use the command ssh root@192.168.31.1 (Xiaomi's standard IP address). The default password is often the one you used to log in to the web interface, or it will be generated by the unlock utility.

Installation of the Breed bootloader (Bootloader)

The Breed bootloader (Bootloader for Realtime Embedded And IoT Devices) is the BIOS of computers, and installation is a key step because it allows you to restore the router in the event of a firmware failure and provides a user-friendly interface for managing device memory.

Once you access SSH, you need to upload the bootloader file to the router's memory. This is done through a copy command. The file must be pre-loaded to your computer. The writing command looks something like this: mtd write breed-mt7621-xiaomi-mi-router-4a-gigabit.bin Bootloader. The exact name of the file depends on the version you downloaded.

⚠️ Warning: Never use mtd write for partitions you're not 100% sure about. An error in selecting a partition (such as writing to "factory" or "caldata") will permanently deprive your device of the ability to work with Wi-Fi.

After writing the file, you need to change the environment variable so that the router knows that you need to start a new bootloader. flag_try_sys1_failed=1 nvram set flag_try_sys2_failed=1, Then you save the nvram commit settings, and then the router is rebootted by the reboot command.

Now, if you turn on the router to press the reset button (Reset), the device should go to Breed mode. the Power indicator will flash yellow or blue, and on the computer in the browser at 192.168.1.1 will open the bootloader console.

Comparison of alternative firmware for Xiaomi 4A

The choice of operating system depends on your needs, each of which has its advantages and disadvantages. Below is a table that helps you decide on your choice.

If you want a put and forget router with a basic ad blocker, Padavan is the perfect choice. It is stable and does not require deep network knowledge. If you plan to deploy a complex home network with VLANs, Docker containers or specific routing scripts, OpenWrt is your choice.

It is worth noting that for the MediaTek MT7621A processor installed in this model, OpenWrt optimization has achieved excellent results. WAN-to-LAN speed with encryption enabled can reach 300-400 Mbps, which is an excellent result for the budget segment.

Process of installing a new operating system

Consider the installation process using the Breed bootloader as the most secure one. Log in to the Breed web interchange (usually 192.168.1.1) by pressing the Reset button when you turn on the router. From the menu on the left, select "Flash".

In the window that opens, click "Choose file" and select the pre-prepared firmware file (.bin). Make sure you select the Firmware update. Press "Upload" or "Flash" button. The process will take about 1-2 minutes.

Formatting the JFFS2 section...




Image recording... 100%




Checking checksums... OK




Reboot...

Once you have completed the recording, the router will automatically restart. If you have installed Padavan, the web interface address may change to 192.168.123.1, and the default login/password is often admin/admin. For OpenWrt, the address usually remains 192.168.1.1, but the password will need to be set the first time you log in.

Possible problems and solutions

There are errors in the process of modification, and users often experience a router that goes into an endless reboot or only the power indicator is on, a condition called a “brick,” but in the case of the Xiaomi 4A Gigabit, it is almost always reversible thanks to the Breed bootloader.

If the Wi-Fi is not working after the firmware, the factory partition is likely to have been damaged, and the solution is to restore the backup of the factory partition through the bootloader console, which is why keeping the backup of the factory partitions before any manipulation is a must.

⚠️ Note: If you upgrade to a new firmware version and some features (e.g., 5GHz network) stop working, complete a Wipe reset via the new system's web interface. Configuration files from older versions often cause conflicts.

If you have driver problems or unstable LAN ports, try changing the duplex speed in your PC network card settings or replacing your Ethernet cable. Sometimes cheap cables can't withstand gigabit speeds after you change the software part of the router.

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The key to success is to preserve the original factory and caldata sections, without them, to restore the unique parts of the factory. MAC-Wi-Fi addresses and signal power will be extremely difficult.

Frequently Asked Questions (FAQ)