How to Reflash Xiaomi 4A Gigabit Edition Router: A Complete Guide to Risks and Solutions

Why do Xiaomi Router 4A Gigabit owners decide to flash the phone?

Xiaomi Mi Router router 4A Gigabit Edition (model) R4AG) Initially, it comes with proprietary firmware MiWiFi, optimized for the Xiaomi ecosystem, but many users face its limitations: lack of support. VPN-servers, cut down on QoS settings, forced binding to the Mi Account and closed source code. Alternative firmware like OpenWRT or Padavan solves these problems by adding customization flexibility, WireGuard support, advanced traffic control, and the ability to install additional packages.

But flashing is not just an “air update”; it’s a complete replacement of the device’s software, which is fraught with risks. Xiaomi’s official warranty burns down after such manipulations, and improper actions can turn the router into a “brick.” In this article, we will discuss the only reliable firmware method through TFTP for Xiaomi 4A Gigabit (relevant for revisions from 2020 to 2023), which minimizes the chances of error, and also consider how to restore if something goes wrong.

Before you go any further, answer the key question: Why do you need an alternative firmware? If the goal is simply to upgrade to MiWiFi, a standard update via the web interface is enough. If you need advanced features, read on, but remember: 90% of firmware problems are due to failure to follow the sequence of actions or use inappropriate files.

Preparation for firmware: what to do before the start

The first step is to check the current firmware version and hardware revision of the router. Go to the Xiaomi Router 4A Gigabit web interface at 192.168.31.1, log in and go to Status → Device.

• 🔹 Model: Must be exactly Mi Router 4A Gigabit Edition (not to be confused with Gigabit Edition) 4A 100M or 4C!).
• 🔹 Firmware version: if worth it 2.XX.XX or newer, for firmware through TFTP You will need to revert to the old version (more on this below).
• 🔹 Hardware revision: on the sticker under the router look for the inscription REV (for example, REV 1.0 or REV This depends on compatibility with firmware.

Next, prepare the equipment and files:

1. A computer with Windows/Linux/macOS and a free Ethernet port (Wi-Fi will not work!).
2. LAN cable (preferably original from the set).
3. Programme TFTP-Server: Recommended for Windows Tftpd64, for Linux/macOS — built-in tftp.
4. Firmware: Download the right file for your revision. For example, for Padavan, look for r4ag-marked builds on 4pda or OpenWRT forums.
5. A needle or paperclip to press the Reset button.

Downloaded firmware for his router revision|I got it. TFTP-PC-server|Prepared. LAN-wire-and-needle|I've backed up the current settings.|Disabled antivirus/firewall (they can block) TFTP)-->

Critically, disconnect all devices from the router except the computer you're going to be flashing from. Also, check that your PC has Wi-Fi turned off, it can conflict with network settings. If you use a laptop, connect it to a power source: interrupting the process due to battery discharge is almost guaranteed to kill the router.

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If your router has already been stitched and is not booting now, try holding the Reset button for 10-15 seconds when power is turned on, sometimes helping to return factory settings.

Firmware selection: OpenWRT vs Padavan vs Official

In the alternative firmware market for Xiaomi 4A Gigabit, two solutions are leading the way: OpenWRT and Padavan. The official MiWiFi firmware also has a right to life, especially if you want stability without “dancing with a drum.”

For most users, Padavan will be the middle ground: it retains the ease of setting up MiWiFi, but adds advanced features. OpenWRT is suitable for enthusiasts who are ready to deal with console commands and configuration through LuCI. Official firmware is relevant if you want maximum stability and support for Xiaomi cloud functions (for example, management through Mi Home).

Where do I look for firmware?

• 📥 OpenWRT: official repository on the project website (look for builds for the project) ramips/mt7621).
• 📥 Padavan: Thematic branches on 4pda (Pay attention to the build date, the current version comes out once in a while. 1-2 month.
• 📥 MiWiFi: official firmware can be downloaded from Xiaomi (select Global or China region depending on your model).

Step-by-step: firmware via TFTP (method for all versions)

This method works even if the router is "bricked" or blocked. 4A Gigabit in recovery mode it automatically connects to TFTP-It takes no more than 5 minutes to get to the server and upload the firmware over the network.

Step 1. Set-up TFTP-server

1. Install Tftpd64 (for Windows) or run built-in tftp on Linux/macOS.
2. Place the firmware file (for example, miwifi_r4ag_firmware_XXXX.bin) folder TFTP-server (by default) C:\Tftpd64).
3. Rename the file to recovery.bin – it is a must!
4. Set up a PC network adapter: IP-Address: 192.168.31.100 Subnet Mask: 255.255.255.0 Gateway: 192.168.31.1 (no matter if it is not there, it is for the correct setting)

Step 2: Transfer the router to recovery mode

1. Turn off the router.
2. Press the Reset button with a needle.
3. Connect the power without releasing the Reset.
4. Hold the button for 20-30 seconds until the indicator flashes orange (this is a TFTP mode signal).

Step 3. Firmware

1. Connect the router to the PC through LAN-port WAN!).
2. Launch it. TFTP-server and wait until the router downloads the file itself recovery.bin (logged Tftpd64 There'll be a transmission record).
3. Once you're on the router, it automatically restarts. Don't turn off power for 3-5 minutes, because you're writing the firmware to flash memory.

⚠️ Note: If you have opened SSH-access for remote settings, be sure to change the standard port 22 to another (e.g. 2222) and set up key authentication instead of a password.

FAQ: Answers to Frequent Questions