Owners of the popular Xiaomi Mi WiFi Router 4C often face the limitations of stock software. The Chinese version of firmware can contain advertising, have a stripped-down functionality or work unstable with a large number of connected devices. That is why the question of how to flash the router Xiaomi 4c becomes relevant for those who want to unleash the full potential of their network equipment.
Installing an alternative operating system like OpenWrt makes it possible to turn a budget device into a powerful network management tool, you get access to advanced security settings, the ability to install additional packages, and fine-tuning wireless network settings, but this process requires care, because careless actions can lead to the device’s failure.
In this article, we will discuss all the steps of preparing and performing the firmware. We will look at methods for bypassing the bootloader protection, working with the TFTP utility and initially configuring the new system. It is important to understand that any manipulation of the software you make at your own risk, so follow the instructions as accurately as possible.
Preparation of equipment and choice of firmware
The first step is to carefully prepare the workspace and software. You will need a computer with Windows, Linux or macOS, as well as a serviceable network cable. Before starting the procedure, you should download the current version of OpenWrt firmware, adapted specifically for the miwifi-mini model (since 4C hardware is often based on this platform or compatible MediaTek chips).
Note the hardware version of your router. There may be a sticker at the bottom of the device indicating a board revision. For the Xiaomi Mi 4C, it is critical to use exactly the build that matches the processor (usually MediaTek MT7628AN). Using an inappropriate file can permanently disable the device.
Where to find the right version of OpenWrt?
You will also need a utility for working with TFTP-Windows standard tools may not work, so it is better to prepare specialized software immediately. Remember to disable the antivirus and firewall during the procedure, so they do not block the transfer of files.
- 🔌 Ethernet network cable (twisted pair) category 5e higher.
- 💻 Computer with network port RJ-45.
- 📁 Downloaded firmware file with.bin extension.
- 🛠 Utility. TFTP-client, Tftpd64 or embedded in Linux).
Resetting settings and entering recovery mode
Before you flash the Xiaomi 4c router, you need to access the system. If you have a Chinese version, you may need to change region or use special scripts to get root rights. However, the most universal method is to use the Recovery Mode, which is built into the device bootloader.
To enter this mode, you need to turn off the router. Then press the reset button, which is usually recessed into the case and requires the use of a paper clip. Without releasing the button, apply power to the device. Hold the button for about 10-15 seconds until the system indicator flashes orange. This signals that the bootloader has entered the firmware waiting mode.
⚠️ Warning: If the indicator is blue immediately after switching on, it means that the recovery mode is not activated. Try repeating the procedure by changing the button holding time or the power supply time.
After successful transition to recovery mode, connect your computer to any LAN-router. IP-Your computer address must be set to receive an address automatically or be statically registered in the subnet. 192.168.1.x. The standard router address in this mode is often 192.168.31.1 or 192.168.1.1.
☑️ Pre-firmware check
Setup of static IP and TFTP server
To successfully load system image through the protocol TFTP You need to set up the network settings of your computer correctly, and that's one of the most important stages where you're most likely to get errors in a beginner's system. IP-address on the network interface through which the router is connected.
Open the network connection settings and select the protocol IPv4. In the properties, specify the following parameters: IP-192.168.1.66 (or other free in the desired subnet), the subnet mask 255.255.255.0. The gateway can not be specified or specify the address of the router. IP-address waiting to see the router loader to receive the file.
Next, we need to start TFTP-server. Tftpd64 Choose the interface with IP-address 192.168.1.66. In the "Current Directory" field, specify the folder where you put the firmware file. Rename the firmware file as required by the bootloader if necessary (often a name is required). firmware.bin or uImage).
| Parameter | Importance for PCs | Expected IP router | Note |
|---|---|---|---|
| IP-address | 192.168.1.66 | 192.168.1.1 | Standard subnetwork |
| Mask | 255.255.255.0 | 255.255.255.0 | Class C |
| Port TFTP | 69 | 69 | Don't block the firewall |
| Protocol | IPv4 | IPv4 | IPv6 is not supported |
Make sure that the Windows firewall does not block the connection. Often the security system perceives requests from the router bootloader as a potential threat and silently drops packets. It is better to temporarily completely disable network protection for the Public Network profile.
The process of loading firmware through TFTP
Now, let's get to the most critical moment. TFTP-The server is running and waiting for the request, and the router is in recovery mode (flashing orange indicator), you can start the process. In some Xiaomi models, the download begins automatically as soon as the router receives the download. IP-address DHCP or sees a request from TFTP-server.
If the automatic boot hasn't started, use the ping command in the command line. Open the console (cmd) and enter ping. 192.168.1.1 -t. As soon as you see the first successful response from the router, immediately initiate file transfer or click the Start button in the TFTP-The client, if you use manual mode, is the key to the timing.
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Use the command line for ping with a flag -t, So you can see when the router is on the network, and that'll help you synchronize the launch. TFTP-server at the time of requesting the file by the bootloader.
In the lairs TFTP-You're going to see the file transfer process on the server, and the lines will change to show the percentage of execution. 1-2% If you have a broken firmware file, it doesn't fit the format or signature, so you need to look for another OpenWrt build or patch an existing one.
During firmware, do not turn off the power of the router. The indicator can change color or go out for a short time - this is normal for the process of overwriting flash memory. Wait until the router itself reboots and the indicator does not light up in a stable color (usually blue or white for OpenWrt).
Initial OpenWrt setup
Once the new system is successfully installed, the router will create its own Wi-Fi hotspot. It may be called "OpenWrt" by default and have no password. Connect to it from your phone or laptop. The Web interface login address is usually 192.168.1.1.
When you first log in, it will ask you to set a password for the root user. Come up with a complex combination of characters, because now your router is open to external control (unless you forbid it yourself). Once you set the password, you will have access to a full LuCI interface.
In the System → Backup / Flash Firmware menu, you can save your current settings or, if necessary, return the stock firmware if the new version is unstable.
- 🌐 Go to System. → Software and click "Update lists" to update the package list.
- 🔒 Install a luci-app-firewall package for easy security management.
- 📡 Set up. WAN-port → Interfaces by selecting the connection type (PPPoE, DHCP, Static).
⚠️ Note: After installing many plugins, the free space in the router's flash memory may run out. → Mount Points".
Decision and recovery
Firmware experiments often have problems. If the router has stopped responding to ping, the indicator is lit red or the device goes into an endless restart (bootloop), do not rush to throw the device away. In most cases, the Xiaomi Mi 4C can be restored.
One common problem is partition mismatch. Stock firmware may use a different markup than OpenWrt. If the router is running after firmware but the Wi-Fi is not on or running smoothly, check the logs in System → Kernel Log. Errors related to mtd or partition will indicate a markup problem.
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If the router is in a bootloop, try pressing the Reset button when turned on for 30 seconds. This can trigger FailSafe mode, allowing you to restore access over telnet without completely flashing.
You can use Failsafe mode to restore access. When you load the router when the LED flashes, quickly press the reset button several times. If everything goes well, the indicator will flash very quickly. In this mode, you can connect to telnet at 192.168.1.1 without a password and execute the firstboot command to reset all settings to the factory.
If the software methods don't work, there's still the option of disassembling the case and running through the CH341A programmer. This requires soldering skills, because you have to sell on the contact areas on the router board. But for the 4C model, this is extremely rare, TFTP is usually enough.