It is impossible to imagine a modern smartphone without stable access to the global network, and Xiaomi Redmi 9 is no exception. This popular budget model is equipped with a module Wi-Fi 802.11ac, which provides decent data transfer speeds in the 2.4 GHz and 5 GHz bands. However, users often encounter situations where the device stops detecting the network, takes a long time to connect, or refuses to work with the router altogether.
The causes of the problems may be software related to shell updates. MIUI, or hardware issues caused by physical impact on the device. In most cases, the problem can be resolved by properly configuring the router or resetting the phone's network settings. Understanding how wireless protocols work will help you avoid common configuration errors.
In this article, we'll detail the connection process, explore hidden developer menus for improving signal reception, and provide an action plan for critical authorization errors. You'll learn to differentiate between provider issues and malfunctions of your device. Redmi 9.
Basic wireless setup
The initial activation of the communication module is done through the quick access panel or the main system settings menu. To do this, swipe down from the top of the screen to reveal the notification shade and look for the fan-shaped icon. If the icon is grayed out, tap it once to activate it. More advanced settings are available further down the page. Settings → Wi-Fi, where a list of available access points is displayed.
When you select your home network, the system will ask you to enter a password. It is important to enter the security key carefully, observing the case of the letters, as the standard WPA2/WPA3 Sensitive to input errors. After successful authorization, a check mark will appear next to the network name, and a signal strength indicator will appear in the status bar.
In rare cases, the phone may hang for a long time at the "Obtaining IP address" stage. This indicates an addressing conflict on the local network or an incorrect DHCP server on the router. Try rebooting the router and try connecting again in a minute.
⚠️ Note: If the system keeps displaying "Authentication Error" when you enter the correct password, try forgetting the network in the Wi-Fi menu, restarting your phone, and re-entering the information.
For advanced users, manual IP address configuration is available. In the menu for the selected network, click the arrow on the right or select "Configure IP" and switch the mode to DHCP on StaticThis is useful if you are setting up port forwarding or want your phone to always have the same address on the local network.
Diagnosing connection problems
If automatic connection does not work, you need to diagnose the network status. Shell MIUI has built-in tools for checking connection quality. Often, the problem isn't the phone itself, but rather channel congestion or a hardware failure after prolonged use without powering down.
The first step should always be a full device reboot, not just turning off the screen. This allows the network stack's temporary buffers to be reset. If the problem persists, it's worth checking whether other devices are connecting to the same access point to rule out a faulty router.
- 📶 Make sure that airplane mode is turned off and does not block the radio modules.
- 🔄 Reboot your router by unplugging it for 10-15 seconds.
- 📡 Check the distance to the signal source and the presence of physical obstacles.
- 🔌 Make sure the date and time on your device are set correctly, as this affects security certificates.
Particular attention should be paid to the frequency range. Model Redmi 9 It supports dual-band mode, but older routers can only operate on the 2.4 GHz frequency, which is noisier in apartment buildings. Switching to 5 GHz can significantly improve speed if the router is within line of sight.
⚠️ Note: Settings interfaces may vary depending on the MIUI firmware version (Global, China, EU). If you don't see this option, check for system updates.
Reset network settings and restore
When simple methods fail, a more radical approach is required: resetting your network settings. This will restore all connection settings to factory defaults, deleting saved passwords and VPN configurations. This is a secure procedure that won't affect your personal files, photos, or contacts.
To perform a reset, go to the section Settings → Connection and sharing → Reset Wi-Fi, mobile networks, and BluetoothThe system will ask you to confirm the action and enter your screen unlock password. After confirmation, the device will reboot, and you will need to re-enter your home internet password.
☑️ Checklist before resetting network settings
This method is especially effective after major operating system updates, when old configuration files may conflict with new drivers. A reset also helps resolve errors where the phone sees the network but doesn't transmit data.
Setting up static IP and DNS
In some cases, dynamic address allocation is unstable, and manually entering the parameters helps stabilize the connection. Using public DNS servers, such as those from Google or Cloudflare, often speeds up page response times and resolves access issues with certain resources.
To change the settings, select your network from the list of available networks, click the gear icon or arrow, then select "IP Settings" and switch to "Manual" mode. Here you'll need to enter the IP address, gateway (usually the router's address), and DNS.
| Parameter | Example of meaning | Description |
|---|---|---|
| IP address | 192.168.1.150 | Unique phone address on the network |
| Gateway | 192.168.1.1 | Your router's address |
| Prefix length | 24 | Default subnet mask |
| DNS 1 | 8.8.8.8 | Google's main server |
| DNS 2 | 1.1.1.1 | Cloudflare Alternative Server |
It's important that the IP address you enter doesn't match the addresses of other devices on the network, otherwise an address conflict will occur. Usually, changing the last digit of the default address assigned by the router is sufficient.
Why change DNS?
Changing DNS servers to faster ones (for example, 8.8.8.8 instead of the automatic ones provided by your ISP) can speed up website loading and resolve the issue where Wi-Fi is connected but the internet is down. This also helps bypass some ISP-level blocking.
Using the engineering menu and hidden functions
For users who want maximum control over the radio module, there's an engineering menu. It can be accessed by entering a special code on your phone. ##64663## Or through the "Service and Feedback" app. A hardware test is available here to check antenna operation.
In the Wi-Fi testing section, you can see the actual signal strength in dBm and select the clearest channel if your router supports manual configuration. This is especially important in homes with dense neighboring networks that create a "mess" in the air.
You can also find channel aggregation options in the advanced Wi-Fi settings (often hidden in the About phone menu by repeatedly clicking on the kernel version). Enabling the feature Wi-Fi Assistant Allows the phone to automatically switch to mobile internet if the wireless network signal becomes too weak.
⚠️ Caution: Use caution in the engineering menu. Changing unknown parameters may result in unstable operation of the communication module or complete loss of signal.
Common mistakes and how to fix them
Users Xiaomi Redmi 9 We often encounter specific errors with standard solutions. Understanding the error code or system behavior allows us to quickly resolve the issue without calling a service center.
For example, the "Saved, protected" message usually means the password is correct, but the encryption type on the router isn't supported by the phone (rare) or the time settings are out of order. The "Unable to obtain IP address" error is resolved by rebooting the router or configuring the static settings as described above.
- 📉 There's a signal, but the internet isn't working—check your balance with your provider.
- 🔄 Cyclic reconnection - Update your Wi-Fi drivers via system update.
- 🔒 The password request keeps repeating - delete the network and create a new access point with a different password.
- 📶 If your phone doesn't see the 5 GHz network, make sure the region is set correctly in your router settings (for example, US or Europe), as 5 GHz channels are restricted in some regions.
If your phone stops detecting any networks after being dropped or exposed to water, the antenna module or cable is likely damaged. In this situation, software solutions are ineffective, and hardware repair is required.
Questions and Answers (FAQ)
Why doesn't Redmi 9 see the 5 GHz network?
Make sure your router is actually broadcasting in this range and that the channel isn't hidden. Also, check your router's region settings: some countries restrict the use of certain 5 GHz frequencies, and your phone may ignore them.
How to increase Wi-Fi speed on Xiaomi?
Use the 5 GHz band if your router is nearby. Disable "Wi-Fi Assistant" in your Wi-Fi settings to prevent your phone from wasting resources constantly searching for the best networks. Resetting your DNS to 8.8.8.8 also helps.
My phone connects to Wi-Fi, but there's no internet. What should I do?
Check the date and time on your device. If they're incorrect, the websites' security certificates aren't validating. Also, try forgetting the network, restarting your phone, and reconnecting.
Is it possible to share over-the-air Wi-Fi on Redmi 9?
Standard Android and MIUI tools don't allow you to share Wi-Fi that your phone receives via Wi-Fi (repeater mode). Your phone can only share mobile data or receive Wi-Fi. Rooting and specific software are required for repeater mode.