Xiaomi Mi WiFi Router 4C in Repetitor Mode: A Complete Guide to Setup

Xiaomi Mi WiFi Router 4C is a compact and budget device that is often bought to expand the coverage of Wi-Fi in the apartment. However, not everyone knows that this device can be used not only as a primary access point, but also as a signal repeater. In this article, we will discuss how to properly configure the Mi Router 4C in network amplifier mode, what limitations this solution has and when to choose alternative methods.

It's important to understand that Xiaomi's official firmware doesn't support out-of-the-box repetitor mode, but with alternative firmware (like Padavan or OpenWRT) and a few tweaks in settings, you can make the device work as an amplifier. We'll look at both, with and without firmware, and we'll give you some tips on how to choose the best solution for your case.

Can you use Xiaomi Mi Router 4C as a repeater without firmware?

Xiaomi’s standard firmware for the Mi Router 4C does not have a built-in repeater function. On the device menu, you will find only modes:

• 📡 Access point (AP) is the primary mode of operation.
• 🔌 Client (STA) – Connecting to another network over Wi-Fi (but without relaying)
• 🔄 Bridge (WDS) – Connecting to another router by air, but losing half the speed.

The last one, WDS, is often confused with repeater mode, which is actually a bridge between two routers that requires manual adjustment on both devices.

• 📉 Speed drops by 2 times (due to duplication of traffic)
• 🔒 Not all routers support WDS with Xiaomi.
• 🔄 You have to manually configure DHCP and IP- addresses.

If you just need to amplify the signal on your existing network without needing to be manipulated, the standard Mi Router 4C firmware is not suitable, but there is a workaround to use the device in Client + AP mode, but this will require additional hardware (for example, a second router).

Step-by-step setting up Mi Router 4C in repeater mode via alternative firmware

The most reliable way to make the Mi Router 4C work like a repeater is to install the Padavan firmware (a modified version of Asuswrt-Merlin), which adds a full-fledged Repeater mode with support for:

• 🔄 Automatic connection to the main network;
• 📶 Range selection options (2.4 GHz or 5 GHz);
• 🔒 Encryption WPA2/WPA3;
• 📊 Connected Device Statistics.

To install Padavan on Mi Router 4C, follow the instructions:

1. Download the latest firmware version for Mi Router 4C from the official Padavan repository (select a file marked miwifi_4c).
2. Connect the router to your computer via LAN cable (do not use the WAN port!).
3. Go to the web interface of the standard firmware at 192.168.31.1, go to Settings → Additional → Software Update.
4. Download the downloaded firmware file and wait for the reboot (about 3-5 minutes).
5. After the update, go to the new interface at 192.168.123.1 (the default login and password will be admin/admin).

Now activate the repeater mode:

1. Go to the Network → Wireless mode (Wireless);
2. In Operation Mode, select Repeater.
3. Click Search, select your main network and enter your password.
4. Save the settings and restart the router.

Restrictions of the repeater mode on Xiaomi Mi Router 4C

Even with Padavan firmware, the Mi Router 4C has a number of limitations to be aware of in advance:

Critical note: if your main router is running 802.11r (Fast Roaming), Xiaomi Mi Router 4C in Repeter mode will not be able to connect to such a network due to lack of standard support, in which case you will either have to disable 802.11r on the main device or choose another repeater.

⚠️ Warning: When using the Mi Router 4C as a repeater on a dual authentication network (e.g., in hotels or corporate networks), the device will not be able to relay such Wi-Fi. Repetitors only work with open networks or secure passwords (WPA2-PSK).

Alternative ways to amplify the signal without repeater mode

If Padavan firmware seems complicated and standard settings don’t fit, consider these options:

• 🔌 Client Mode + Additional Router: Connect Mi Router 4C to the main Wi-Fi network in Client Mode, and then connect it with a LAN-LAN cable to the second router that will distribute the Internet. Minus: you will need a second device.
• 📶 Power antenna: Replace the standard antennas with 5 dBi or 9 dBi (e.g. from TP-Link) which will amplify the signal by 20-30%, but will not solve the dead zone problem.
• 🔄 Powerline adapters: If thick walls are a problem, use TP-Link AV1000 adapters that transmit internet over wiring. Speeds up to 500 Mbps, but are sensitive to wiring quality.

For apartments up to 60 m2, the best solution is often to replace the router with a model that supports Mesh (for example, Xiaomi AX3000T or TP-Link Deco X20), such systems automatically switch devices between access points without losing speed.

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If you use Xiaomi Mi Router 4C in a small apartment, try changing the Wi-Fi channel on the main router first. Often the cause of the weak signal is interference from neighbors. In the settings, select channel 1, 6 or 11 (they do not overlap) and check the speed again.

Xiaomi Mi Router 4C compared to other repeaters

To understand whether to mess with the setting of the Mi Router 4C or better buy a specialized repeater, compare it with popular models:

As you can see from the table, the Mi Router 4C is less than specialized repeaters in speed and functionality, but its plus is flexibility: if necessary, the device can be returned to the main router mode or used for other tasks (for example, as an access point for IP- cameras).

⚠️ Warning: If your ISP uses a binding to a MAC- address, setting up Mi Router 4C in repeater mode may require cloning the MAC- address of the main router. Otherwise, the Internet will not work. This option is available in the Network → MAC Clone menu (in Padavan firmware).

Frequent errors in setting up and their solutions

When you try to use the Mi Router 4C as a repeater, you're faced with some common problems, and here are the most common ways to fix them:

• 🔴 Repiter does not connect to the main network: Check that the main router is not using 802.11r (Fast Roaming) or WPA3-Enterprise. Also make sure that the network name (SSID) is free of Cyrillic characters or spaces.
• 🔄 Permanent connection breaks: Reduce the transmission power on the main router (in Wi-Fi settings, set 50% instead of 100%) This will reduce interference.
• 📉 Speeds below 10 Mbps: Try locking a channel on the main router (e.g. 6) instead of Auto mode. Repeters don't work well with automatic channel change.
• 🔒 You can't go to the repeater settings: Once the repeater mode IP- is activated, the device's address may change. Try connecting to its network over Wi-Fi and go to 192.168.123.1 or miwifi.com.

If the repeater is still unstable after all the manipulations, check the firmware version. For the Mi Router 4C, current Padavan builds are laid out on 4PDA. Outdated versions (over 2023) may contain bugs.

When should I give up the idea of using the Mi Router 4C as a repeater?

Despite its versatility, the Xiaomi Mi Router 4C is not always suitable for the role of a repeater.

• 🏢 Coverage exceeds 80 m2: The maximum range of the Mi Router 4C in repeater mode is about 15 meters from the main router. For larger homes, it is better to use Mesh systems.
• 🎮 Needs stable connectivity for online gaming: Due to dual relay (router → repeater → device), ping in games can grow to 100+ ms. For gamers, it is better to pull a cable or use Powerline.
• 📺 Planned to broadcast 4K- video: The maximum speed in repeater mode is about 100 Mbit / s. For streaming video in high resolution, this is not enough (need 150+ Mbit / s).
• 🔒 Additional authentication network: If the provider requires a login/password (PPPoE) or uses VLAN, the repeater will not be able to relay such internet.

In these cases, it is more rational to consider:

• 📡 Specialized repeaters (e.g., TP-Link RE605X with Wi-Fi 6 support)
• 🔌 Mesh System (Xiaomi Mesh System or ASUS ZenWiFi)
• 🖥️ Wired connection (via Ethernet or Powerline).

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Xiaomi Mi Router 4C in repeater mode is a temporary solution for small rooms. For stable operation in large apartments or at high loads (games, 4K), it is better to use specialized equipment.

FAQ: Answers to Frequent Questions