How to flash Xiaomi Router 4A on Padavan: from unlock to fine-tuning

Xiaomi Router 4A (R4A Gigabit Edition and R4A Dual Band) has long been popular because of its price-to-feature ratio. However, standard MiWiFi firmware limits users: no flexible network configuration, no support for VPN- servers, and the interface is overloaded with unnecessary cloud-based features. Padavan’s alternative firmware solves these problems by opening up access to advanced capabilities from bandwid management to building gos from devices.

Padavan firmware is not a beginner process, but it doesn’t require professional skills. The main thing is to follow the instructions and understand the risks: wrong actions can turn a router into a brick. In this guide, we will analyze all the steps from unlocking the bootloader to recovering from a failed firmware, taking into account the features of the Xiaomi Router 4A 2023-2026, you will learn which version of the Padavan to choose, how to avoid typical errors and what settings should be changed immediately after installation.

1.Preparation: What will be needed for firmware

Before you start, gather everything you need, and without proper preparation, the risk of error increases dramatically.

• 🔌 Xiaomi Router 4A (check the model on the sticker on the bottom - should be listed R4A or R4AG).
• 🔗 Patch cord (cable for direct connection of router to PC).

Pay special attention to the choice of Padavan version. Xiaomi Router 4A builds are suitable based on the core 4.4.x or 5.4.x, but it is better to take those that are labeled as stable. Avoid "raw" night builds (nightly) - they may contain critical bugs. Check compatibility on forums: for example, for the model R4AG (Gigabit) you need firmware with support for mt7621.

⚠️ Warning: If your router was purchased after 2022, there is a high probability that it has a locked bootloader installed, in which case an additional step will be required - unlocking via SSH or special scripts.

2. Unlock the bootloader: bypass the limitations of Xiaomi

Since 2021, Xiaomi has been blocking the bootloader on its routers to prevent custom firmware installation. If your Router 4A is released later, you can not unblock Padavan without unlocking. You can check the status of the bootloader through SSH or by the behavior of the router when trying firmware (Invalid firmware error).

There are two main methods of unlocking:

1. Through a vulnerability in the web interface (works on older versions of MiWiFi firmware up to 2.28.XX). Requires you to enter a special command in the address bar of the browser.
2. telnet/SSH exploit (universal method, but command line skills are needed).

So let's think of the second method as a more reliable one.

1. Connect the router to the PC via cable and turn it on.
2. Open the command line (Win + R → cmd) and execute: arp -a Remember IP- router address (usually 192.168.31.1 or 192.168.0.1).
3. Run an exploit to enable telnet: curl -v -X POST http://192.168.31.1/cgi-bin/luci/;stok=XXX/api/misystem/c_startup (where XXX is your stok, which can be obtained through a browser inspector).
4. Connect via telnet and execute commands to unlock the bootloader.

⚠️ Warning: Once the bootloader is unlocked, the router may reset to factory settings. Pre-save the network configuration (e.g., take a picture of a page with Wi-Fi and PPPoE settings).

3. Selection of the Padavan version: which firmware to download

The correct firmware choice depends on the stability of the router. For Xiaomi Router 4A, there are several branches of Padavan:

For most users, the best choice is Padavan 5.4 from developer chongsheng.This version is regularly updated and has a minimum number of bugs. download firmware only from trusted sources (for example, right.com.cn or 4PDA) to avoid fake files with viruses.

For the Xiaomi Router 4A Gigabit Edition, look for files marked with:

• 🔹 mt7621 — for a model with a MediaTek processor MT7621.
• 🔹 64m — if the router has 64 MB of RAM.
• 🔹 squashfs is a firmware compression format.

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Before downloading, check the checksum (MD5 or SHA256) of the firmware file, which will protect against corrupted or fake files, and compare the hash to what is listed on the developer's website.

4. Step-by-step instructions for firmware through Breed

The most reliable way to install Padavan is through Breed Web Recovery, an alternative bootloader that allows you to flash the router even if the standard MiWiFi interface refuses to accept custom firmware.

Follow the instructions:

Install drivers for MediaTek chip (if Windows does not recognize the router)| Download Breed for Xiaomi R4A| Connect the router to the PC via cable | Disable the firewall and antivirus (they can block the process)| Charge the laptop or connect the PC to the UPS

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1. Install Breed: Download the archive from Breed for MT7621. Unpack and launch flash_tool.exe. Select the router port (usually COM3 or COM4) and swipe Breed.
2. Boot in Breed: Turn off the router. Press the Reset button and turn on the power. Hold the 10-15 second button until the orange light light comes on.

Padavan

• Open the browser address 192.168.1.1 (Breed interface).
• In the Firmware Update section, select the downloaded firmware file.
• Press Upload and wait until it is completed (3-5 minutes).

Once the firmware is successfully installed, the router will restart. It can take up to 10 minutes to turn on -- don't interrupt the process! If the SYS flashes green, it's a success.

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If the router doesn't respond after you've run the firmware, try resetting with the Reset button (hold 30 seconds), which solves the problem 90% of the time.

5.Padavan Initial Setup After Installation

After the first download, Padavan will open the web interface on 192.168.123.1 (the username and password is usually admin/admin by default).

• 🌐 Internet connection: Go to Network → WAN. Select the connection type (PPPoE, Dynamic IP or Static IP). For PPPoE, enter the username/password from the provider (check them in the contract).
• 📶 Wi-Fi setup: In Network → Wireless, set up the network name (SSID) and password. It is recommended to use the 802.11ac standard (for R4AG) and the 40 MHz channel width for speed and stability balance. Disable WPS is a vulnerable protocol.
• 🔒 Security: Change the admin password in Administration → Admin Password. Enable Firewall and turn off Remote Access.

Note the Bandwidth Limiter section, where you can limit the speed for individual devices (useful if someone eats up all traffic). It is also recommended to enable DNS-over-TLS in Network → DHCP and DNS to protect against DNS substitution by the provider.

⚠️ Warning: If the Internet is down after setting up, check the settings VLAN in Network → Switch. Some providers (e.g. Rostelecom) require a WAN port to VLAN ID 10 binding.

6. Advanced Padavan features: what can be customized

The main advantage of Padavan is flexibility. Here's what you can do with a router after you've run it.

• 🔄 Dual NAT and bridges: Connect two routers to a single network or configure Bridge for IP-telephony.
• 🛡️ VPN- Server: Run OpenVPN or WireGuard for secure access to your home network from the outside.
• 📊 Traffic monitoring: Enable Bandwidth Monitor to analyze consumption by device.
• 🔌 USB-Modems: Connect a 3G/4G-modem (e.g., Huawei E3372) and use it as a backup channel.
• 🖥️ Samba Server: Connect an external hard drive to the USB- router port and deploy network storage.

To set up WireGuard VPN:

1. Go to VPN → WireGuard Server.
2. Generate keys or download a configuration file.
3. Set up the default port (51820) and enable NAT to access the local network.
4. Download config to your phone/PC and connect via the WireGuard app.

If you plan to use a router as a Tor gateway, install the tor package through Administration → Scripts → Commands:

opkg update && opkg install tor

Typical problems and their solutions

Even with the right firmware, there can be errors.

If the router is "blocked" (does not respond to reset), try to restore it through the UART-port. You will need a soldering iron and a USB-TTL adapter. Instructions for unpacking contacts for Xiaomi R4A can be found on the OpenWRT wiki.

8.Return to stock firmware: how to roll back

If Padavan didn't make it or there were some unsolvable problems, you can return the standard MiWiFi firmware.

1. Download the official firmware for Xiaomi Router 4A from the Xiaomi Support website.
2. Rename the file to miwifi.bin.
3. Sweat through Breed (similar to Padavan installation).
4. After reset, reset the settings (Reset).

Important: When you return to stock firmware, all Padavan settings will be lost. If you have set up a VPN or Samba, save the configuration files in advance (they are stored in /etc).

Also note that after returning to MiWiFi, you may need to re-unlock the bootloader if you plan to install Padavan again.

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MiWiFi stock firmware is automatically updated over the Internet. To prevent an accidental update (which the bootloader will block), disable the Auto Update option in the router settings.

FAQ: Answers to Frequent Questions