How to flash the Xiaomi 4A Gigabit router: official and alternative methods

The Xiaomi 4A Gigabit Edition (R4AC) router remains a popular choice due to the balance of price, performance and gigabit ports. However, over time, even this device requires a firmware update – whether to fix vulnerabilities, add new features (for example, support for Mesh networks) or optimize work with modern Wi-Fi 6 standards. Unlike smartphones, router firmware has its own nuances: there is no recovery-mode, and the error can leave the device a brick.

This article covers all the current ways of firmware Xiaomi 4A Gigabit in 2026: From an Official Update via Web Interface to a Manual bootloader SSH We will discuss how to avoid common errors (for example, Invalid file format), where to download verified firmware files, and what to do if the router stopped responding after a failed update. MIUI for routers (4.6.45)+), Xiaomi has changed the mechanism of verification of signature files.

Preparation for firmware: what to do before the update

The first step is to keep the router's current configuration, and even if the upgrade is successful, newer firmware versions sometimes reset to factory settings, so as not to reconfigure Wi-Fi, PPPoE and the guest network:

• 📥 Export configuration through Settings → Additionally. → Backup. Save the file to your computer.
• 🔄 Check the version of the current firmware in Status → This will help you choose the right file to update.
• 🔌 Connect the router to a UPS or laptop. Breaking power during firmware can make the device inoperable.
• 🌐 Disconnect all customers from the network, except the computer you're flashing from.

Also prepare an emergency cable (Ethernet) in case the Wi-Fi stops working after the upgrade. Xiaomi 4A Gigabit models with firmware older than 2022 may need to roll back to the factory version before installing alternative firmware - we will talk about this in the appropriate section.

⚠️ Note: If your router was purchased in China (version) CN), Global firmware may not be suitable due to differences in radio frequencies!

Official firmware through the web interface

The safest way to do this is to upgrade through the standard MiWiFi interface, which is suitable for most users and doesn't require any technical skills.

1. Connect to the router via cable or Wi-Fi (wired connection is recommended).
2. Open your browser and go to 192.168.31.1 (or miwifi.com).
3. Sign in (by default login and password – admin).
4. Go to the firmware update (the section may be called Firmware Upgrade in English).
5. Click Update Check. If the new version is available, the system will prompt you to download and install it.

If the automatic update does not find a new firmware (relevant for routers with modified firmware), you can download the file manually:

• 🔍 Download the official firmware from the Xiaomi website (choose the version for the 4A Gigabit).
• 📁 Unpack the archive (if the file is.zip or.tar).
• 🖥️ In the router interface, select Manual Download and specify the path to the.bin file.

The upgrade process will take 3-5 minutes. Don't turn off power or restart the router at this time! Once completed, the device will restart automatically.

Update via SSH: for experienced users

If the web interface is not working (for example, due to a failure) or you need a specific firmware version that is not available through MiWiFi, you can use it. SSH-This method requires basic command line knowledge.

First, turn on SSH on the router:

1. Go to Settings. → Additionally. → SSH.
2. Activate access and set a password (remember it!).
3. Connect to the router via SSH using PuTTY (Windows) or terminal (macOS/Linux):

ssh root@192.168.31.1

Enter your password when requested.

Next, download the firmware to your computer and upload it to the router using SCP:

scp firmware.bin root@192.168.31.1:/tmp

Now, run commands to update:

cd /tmp


mtd write firmware.bin firmware




reboot

⚠️ Attention: The wrong mtd command can damage the boot partition! make sure the firmware file name is correct.For Xiaomi 4A Gigabit is called firmware, not kernel or rootfs.

Connection by cable (not Wi-Fi)

Backup copy of settings saved

Firmware file downloaded from official source

SSH password changed from default

Mtd commands tested for model compliance-->

Alternative firmware: OpenWRT and Padavan

Xiaomi’s official software doesn’t always suit users: limited QoS settings, no WireGuard or AdGuard Home push for custom firmware installation. Xiaomi 4A Gigabit is available:

• 🐧 OpenWRT is a flexible system with support for thousands of packages, but requires manual configuration.
• 🚀 Padavan – optimized firmware with improved interface and support for Wi-Fi 6.
• 🔒 LEDE — OpenWRT fork with emphasis on stability.

The process of installing alternative firmware is more complicated than the official one and includes several stages:

1. Unlock the bootloader (for some versions of Xiaomi firmware).
2. Installation via SSH or UART (if the web interface is blocked).
3. Network settings after the first download (IP-The address may change to 192.168.1.1).

Example of commands for OpenWRT installation:

cd /tmp


wget https://downloads.openwrt.org/releases/23.05.2/targets/ramips/mt7621/openwrt-23.05.2-ramips-mt7621-xiaomi_mi-router-4a-gigabit-squashfs-sysupgrade.bin




sysupgrade -n openwrt-*.bin

Solving Firmware Errors

Even when you follow the instructions, you can get errors, and here are the most common ways to correct them:

• 🚫 Invalid file format — the firmware file is corrupted or not intended for your model.
• ⏳ Updating... hangs for more than 10 minutes — interrupt the process by holding the Reset button for 10 seconds.
• 🔌 The router does not turn on after the update - try an emergency reset: hold Reset when power is turned on 15-20 seconds.
• 🌐 No access to 192.168.31.1 after firmware - check IP-router address (possibly changed to 192.168.1.1).

If the router does not respond to the reset, the boot partition may be damaged, in which case you will need to restore via UART:

1. Disassemble the router and find UART contacts (usually 4 pins: GND, TX, RX, 3.3V).
2. Connect a USB-to-TTL adapter (such as the CP2102) to your computer.
3. Use PuTTY or screen to connect to the console (speed 57600 baud).
4. Interrupt the boot (press any key in the first 2 seconds) and enter commands to recover.

💡

If you lose Wi-Fi after your firmware, check the region in your wireless settings. For Russia, choose RU, for Europe, EU. The wrong region may block some channels.

Reverse to the previous version of the firmware

New firmware doesn’t always work consistently, with problems with IPTV connectivity, Wi-Fi speeds slowing down, or some features disappearing, in which case a rollback to the previous version will help.

For official firmware:

1. Download the desired version from the archive of Xiaomi.
2. Download it via the web interface (Manual Download).
3. Confirm the rollback - the router will restart.

For alternative firmware (e.g. OpenWRT):

cd /tmp


wget [link to the old version]




sysupgrade -n -F old_firmware.bin

⚠️ Warning: A rollback to a version older than 2 years can cause compatibility issues with modern devices (for example, iPhone 15 or Samsung Galaxy) S23 You will not be able to connect to Wi-Fi due to outdated security protocols).

Firmware via Mi Home/Mi WiFi (mobile application)

Xiaomi offers to update routers via the Mi Home mobile app (or Mi WiFi for some regions), a method that is convenient but has limitations:

• ✅ Automatic definition of the router model.
• ✅ Notifications of new firmware versions.
• ❌ No way to choose a specific version (only the latest version).
• ❌ It does not work for alternative firmware.

Instructions:

1. Connect to the router network from your phone.
2. Open Mi Home, select your Xiaomi 4A Gigabit.
3. Go to the device settings → Update the firmware.
4. Click Update and wait until it is completed.

If the application does not find the router, check:

• 📶 Are you connected to your network (not to another access point).
• 🔄 Is the Mi Home app itself updated.
• 🌍 The region in the application corresponds to the region of the router (for example, Russia for the RU-version).

💡

The mobile app is convenient for beginners, but not for manual version selection or custom firmware installation. Use a web interface or SSH for full control.

FAQ: Frequent questions about Xiaomi firmware 4A Gigabit