The situation when a modern smartphone Xiaomi or Redmi A device refusing to connect to a wireless network is quite common and can catch you off guard. It typically occurs at the most inopportune moment, when you urgently need to send a file or end a work call. The problem can manifest itself in various ways: the device simply doesn't detect the network, displays "Authentication Error," or is stuck indefinitely in the "Obtaining IP Address" status.
Reasons for this behavior smartphone are hidden in software failures of the operating system MIUI or HyperOS, as well as conflicting router settings. Sometimes the culprit is an overloaded communication channel or a simple malfunction in the phone's network module. It's important to understand that in 90% of cases, the problem can be resolved without calling a service center.
In this article, we'll cover diagnostic algorithms to help restore your connection. We'll cover static address settings, DHCP server operation, and specific power-saving features that often block Wi-Fi. Follow the instructions step by step to rule out the main factors causing the failure.
Basic diagnostics and module reboot
The first and most effective step for any network issue is a full hardware reboot. Don't skip this step, as it clears the temporary network service cache and resets frozen processes. Unplug the router for 10-15 seconds, then plug it back in.
On the smartphone side Xiaomi You need to perform a soft reset of your network settings. This won't delete your personal data, but it will clear your saved WiFi profiles and Bluetooth settings. Go to the menu Settings → Connection and sharing → Reset Wi-Fi, mobile networks, and BluetoothAfter this, try connecting again.
A common cause of connection failure is an IP address conflict within the local network. If the router assigns an address that is already occupied by another device, compound It won't install. In this case, switching to airplane mode helps. Turn it on for 5-10 seconds, then turn it off. This will force a restart of the phone's radio module.
⚠️ Important: If the router's lights flash erratically or remain red after rebooting, the problem may be with your internet service provider. Check for line interruptions or outstanding bills.
Sometimes the system Android "Forgets" the correct encryption settings for a specific access point. Try deleting the network from the list of saved networks. Click the gear icon next to your network name and select "Delete" or "Forget this network." Then re-enter the password, carefully checking the capitalization.
Setting up a static IP address
One of the most common reasons why a phone displays "Obtaining IP address" and then disconnects is a malfunctioning DHCP server on the router. In this case, the device cannot automatically obtain the correct network coordinates. The solution is to manually enter the addresses.
First, you need to find out your current network settings. This can be done by connecting any other working device (a laptop or a friend's phone) to the router. You'll need: the gateway IP address (usually the router's address), the subnet mask, and the DNS servers. Xiaomi Go to WiFi settings, click on the arrow next to the network name or select "Edit".
In the "IP Settings" section, change the value from DHCP to "Static." Here, you must enter the information manually. The phone's IP address should differ from the router's address only by the last digit (for example, if the router is 192.168.0.1, then the phone's IP address can be 192.168.0.55). The gateway and network prefix length (usually 24) must match the router's information.
Example settings for a static IP:IP address: 192.168.1.155
Gateway: 192.168.1.1
Network prefix length: 24
DNS 1: 8.8.8.8
DNS 2: 8.8.4.4
Using public DNS servers from Google (8.8.8.8) or Cloudflare (1.1.1.1) often solves issues with slow website resolution, even with a successful connection. This is especially true if your ISP provides their own DNS servers, which are unstable. After entering all the information, click "Save."
Bandwidth and channel issues
Modern routers operate in two bands: 2.4 GHz and 5 GHz. Older models Xiaomi or budget series Redmi may not support the 5 GHz frequency, which is why the network simply doesn't appear in the list of available networks. Make sure your phone supports the standard. 802.11ac or ax.
The 2.4 GHz band is often overloaded, especially in apartment buildings. Neighboring routers create a "mess" of signals, leading to packet loss and authentication failure. The most logical solution is to switch your router to a less congested channel. This is done through the router's web interface (usually at 192.168.0.1 or 192.168.1.1).
In the Wireless Settings, find the "Channel" option. Instead of "Auto," select a fixed number: 1, 6, or 11. These channels don't overlap and provide the most stable connection. For the 5 GHz band, you can select channels 36, 40, 44, or 48.
| Parameter | 2.4 GHz band | 5 GHz band |
|---|---|---|
| Range | High (breaks through walls) | Low (fades behind obstacles) |
| Speed | Up to 150-300 Mbps | Up to 800+ Mbps |
| Workload | Very high | Low |
| Recommended channel | 1, 6, 11 | 36, 40, 44, 48 |
It's also worth paying attention to the channel width. For 2.4 GHz, it's best to set the value 20 MHz. Installation 40 MHz In noisy environments, this often leads to signal destabilization, although theoretically the speed should increase. For 5 GHz, you can safely leave 80 MHz or Auto.
⚠️ Note: Router interfaces from different manufacturers (TP-Link, Asus, Keenetic) vary. Look for the "Wireless," "Wireless Mode," or "WLAN" sections. If you're unsure of the settings, it's best to reset the router to factory settings using the Reset button.
☑️ Checking router settings
Time and security certificate failure
Many users are surprised to learn that an incorrect date and time on their phone can block their Wi-Fi connection. Security protocols (WPA2/WPA3) and SSL certificates require time synchronization. If the device displays the year 2020 when it's actually 2026, the router or ISP's security server will reject the connection.
Check the date settings in the menu Settings → Advanced → Date and TimeMake sure "Use network time" or "Automatically detect" is checked. If the issue persists, try manually setting the current date, disabling automatic detection, restarting the phone, and then re-enabling automatic mode.
Another nuance is related to the encryption type. Some older phones Xiaomi don't know how to work with the new encryption standard WPA3If the router is configured for WPA3 only, the phone will see the network but won't be able to connect. Go to the router settings and select combined mode. WPA2/WPA3 Mixed or just WPA2-PSK (AES).
In rare cases, changing the network name (SSID) can help. If your network name contains Cyrillic characters or special symbols, some WiFi modules may not work correctly. Rename the network using only Latin letters and numbers, without spaces.
Why is the date important?
The HTTPS protocol and WPA-Enterprise authorization mechanisms use timestamps to verify certificate validity. A time difference of more than 5 minutes often results in a "Failed to obtain IP" error or an infinite connection loop.
The Impact of Power Saving and MIUI Optimization
shell MIUI and new HyperOS are known for their aggressive power-saving policies. The system can forcibly disable the WiFi module if it detects an inactive connection or block network services to conserve battery life. This often happens on models of the series. Redmi Note And Poco.
To rule this out, go to the advanced WiFi settings. They are usually hidden. Try going to Settings → About phone → MIUI version and quickly tap 10 times on the build number to enable developer mode. Then in Settings → Advanced settings → For developers Find the option "Enable MIUI optimization" and disable it.
Also check your traffic saving settings. In the menu Settings → Connection and Sharing → Data Saver Make sure system services aren't restricted. Sometimes resetting network settings, as we mentioned at the beginning, but also recalibrating the battery, helps.
Some antivirus programs or phone speed-up apps can conflict with network drivers. If you have Clean Master, DU Battery Saver, or similar apps installed, try uninstalling them and testing your WiFi performance with your system clean.
Factory reset and hardware failures
If software methods fail, the last resort is a hard reset. This will return your phone to its out-of-the-box state. Before doing this, be sure to back up your data to the cloud or your computer, as all photos and contacts will be deleted.
To reset, go to Settings → About phone → Factory data reset → Erase all dataOnce turned on, the phone will be as good as new. If, even without installing third-party apps, the WiFi still doesn't work, there's a high probability of hardware failure.
Hardware problems with the WiFi module in Xiaomi These problems occur, especially after drops or exposure to water. Symptoms: WiFi turns on and then immediately turns off, the WiFi icon is grayed out, and there's no network scanning even after re-soldering the antenna (this is difficult to do at home).
- 📱 The phone was dropped from a height or was subjected to impact.
- 💧 The device has been exposed to water or has been in the bathroom for a long time.
- 🔥 The device overheated significantly while charging or playing games.
- 📉 WiFi only works in close proximity to the router (1-2 meters).
In the event of a hardware failure, only a service center can help. Technicians will check the antenna module and the circuit board. Sometimes, the WiFi module itself may need to be replaced or the chip resoldered, which requires professional equipment.
Why can't Xiaomi see the 5 GHz network?
Your phone most likely only supports the 802.11 b/g/n (2.4 GHz) standard. Mid-range and budget models often lack a 5 GHz module. Check the specifications for your specific model on the official website.
What should I do if it says "Saved, protected"?
This means the password is entered correctly, but the router is blocking the connection based on the MAC address or encryption type. Try changing the router's security type to WPA2-PSK (AES) and disabling MAC address filtering in the router settings.
How do I know if my WiFi module is burned out?
If after a full reset (Hard Reset) the phone does not search for networks at all, the WiFi icon is gray or has disappeared, and when the module is turned on the phone starts to heat up in the camera area, most likely the WiFi module is faulty.
Can MIUI update break WiFi?
Yes, sometimes new firmware versions contain bugs that disrupt driver operation. In such cases, waiting for the next update with a fix or, for advanced users, rolling back to the previous stable software version can help.