How to improve the Internet on Xiaomi Redmi 9: from basic settings to hidden chips

Xiaomi Redmi 9 remains one of the most popular budget smartphones even years after its release, but many users are faced with the problem of slow Internet. The reasons can lie in both the software settings and hardware limitations of the device. In this article, we will discuss 10 proven ways to improve mobile Internet and Wi-Fi speeds on Redmi 9, including little-known tricks with firmware and modem settings.

Redmi 9 is equipped with a chipset MediaTek Helio G80, It's a system that has limitations on the ability to support modern networks, such as the device doesn't officially support the network. 5G, but even online 4G LTE You can get the most out of it by setting the parameters right. MIUI 12.5 and MIUI 13 – The results are shown in the comparative table below.

1. Checking the current speed and diagnosing problems

Before optimizing your network, you need to know where the bottleneck is. Use speed testing applications like Speedtest by Ookla or nPerf. Run the test at least 3 times in different conditions:

• 📶 Mobile Internet (4G/LTE) well-signaled;
• 📶 Mobile Internet in a room with a weak signal;
• 📡 Wi-Fi at a distance of 1-2 meters from the router;
• 📡 Wi-Fi in another room.

Pay attention to three key parameters:

• Ping (latency) – if above 100 ms, there will be lags in games and delays when loading pages;
• Download speed – for comfortable video viewing 1080p You need a minimum of 10 Mbps;
• Upload speed – important for streaming and video calls (optimum 5)+ Mbit/s).

If the speed is lower than expected, compare the results with the reference values for Redmi 9:

⚠️ Note: If the speed on Wi-Fi is higher than on a mobile network, the problem lies in the settings of the operator or SIM-Try to rearrange the maps. SIM to another slot (if any) or use ##4636## to diagnose.

2. Optimizing the mobile Internet (4G/LTE)

Redmi 9 is supported by LTE Cat. 7, but by default MIUI It's often speed-limiting because of energy-saving algorithms. Here's how to fix it:

Forced network selection 4G

By default, the smartphone can automatically switch to 3G or 2G We're going to have a weak signal, which is a very slow speed, so we can only pick up the signal. 4G:

1. Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Type of network;
2. Select Only. LTE (or 4G/3G/2G (vehicle if the first option does not work);
3. Reset the device.

If LTE Only is not available, use the engineering menu:

Enter the dialer: ##4636###


Go to the tab "Phone Information"




In the "Install preferred network type" section, select "LTE only"

Adjustment APN maximum speed

Wrong parameters APN (access points) may limit speed. Delete all current APN And create a new one with your operator's parameters:

• Name: MTS
• APN: internet.mts.ru
• Type of authentication: PAP
• APN Protocol: IPv4/IPv6
• Type APN: default,supl

💡

Before the change APN Save your current settings -- some operators block manual settings. If the Internet goes down after the changes, reset your network settings to Settings. → System system → Resetting settings → Resetting network settings

Disconnecting energy saving for mobile data

MIUI aggressively restricts the background activity of applications to save charge, which can slow down content loading, to disable restrictions:

1. Go to Settings. → Battery and productivity → Battery mode;
2. Choose High Performance;
3. In Battery Optimization, find apps that use the internet (like YouTube, Telegram) and turn off optimization for them.

⚠️ Warning: High performance increases battery consumption by 15-20%, only when you're using the Internet.

3. Improve Wi-Fi Signal: From Channel Selection to Router Firmware

Weak Wi-Fi is one of the main reasons for slow internet on Redmi 9, and the problem can be on the side of the smartphone or the router.

3.1. Analysis of Wi-Fi network using applications

Install WiFi Analyzer (or analogues) and check:

• 📊 Channel congestion – if your router is running on the same channel as 5 neighboring networks, there will be interference;
• 📶 Signal level - if lower -70 dBm, speed will fall;
• 🔄 Frequency – Redmi 9 supports 2.4 GHz and 5 GHz, but at 5 GHz, the signal is weaker through walls.

3.2 Optimal router settings for Redmi 9

Go to the router control panel (usually at 192.168.1.1 or 192.168.0.1) and change:

Change the width of the channel to 40/80 MHz|

Turn on WPA2/WPA3 (not WEP!)|

Disable QoS (if not in use)|

Update the router to the latest version-->

Hidden Wi-Fi settings in the MIUI

Redmi 9 has hidden parameters that can be changed by the ADB (You need to set up the debugging USB):

adb shell settings put global wifi_supplicant_scan_interval 120


adb shell settings put global wifi_watchdog_on 0

These teams:

• Increase the interval of network scanning (saves battery and reduces the load on the Wi-Fi module);
• Disable the “watchdog” Wi-Fi, which can break the connection at a weak signal.

⚠️ Attention: Wrong commands ADB They can disrupt the system. If you're not sure, skip it.

Hardware Restrictions of Redmi 9: What Cannot Be Fixed Software

Redmi 9 has a hardware limit on the download speed 4G-networks — the maximum possible speed is 150-170 Mbps, even under ideal conditions. G80, supportive LTE Cat. 7 (2CA) For comparison, even budget smartphones from 2023 (like the Redmi 12) are equipped with LTE Cat. 13 with 400 support+ Mbit/s.

However, there are ways to get around some of the limitations:

• 🔧 Replacement of antenna – if the signal is weak, you can replace the antenna module (cost) ~500-800 rubles.);
• 📡 External antenna 4G — connects through the adapter to SIM-Slot (requires disassembly of the phone);
• 🔄 Using Wi-Fi instead of mobile internet – if the router supports 5GHz with 80MHz channel width, the speed will be higher.

5. Alternative firmware: should you switch to caste?

Stock firmware MIUI It is often to blame for speed limits due to background processes and optimizations. Alternative firmware (like LineageOS or Pixel Experience) can give you performance gains, but there are nuances:

If you decide to switch to custom firmware, follow the instructions:

1. Unlock the bootloader through the official Xiaomi website (can take up to 7 days);
2. Install. TWRP Redmi 9 (version 3.6.2 or later);
3. Sweep through firmware and GApps (if you need Google services);
4. After installation, check IMEI and modem operation in ##4636##.

💡

Switching to custom firmware can increase the speed of the Internet 20–30%, You risk losing your security and stability. VoLTE/ViLTE.

6. Software tricks: Accelerating without root

If you don’t want to take risks with firmware, try these methods:

Disabling background activity of unnecessary applications

Many apps (especially social media and instant messengers) consume traffic in the background to limit them:

1. Go to Settings → Applications → Application Management;
2. Choose an app (such as Facebook);
3. Turn off Auto Start and Background Activity;
4. In the Mobile Traffic section, disable Background data.

6.2. Use of VPN circumventing operator restrictions

Some operators (such as Tele2 or Iota) artificially limit the speed for certain services (Torrent, YouTube). VPN This can help you bypass these restrictions:

• 🔒 ProtonVPN (free rate with 3 countries restriction);
• 🔒 Cloudflare Warp (minimum delays, but not always bypasses locks);
• 🔒 AdGuard VPN (Good for circumventing torrent restrictions).

It's important: VPN delay (+10–50 ms, so it is better not to use for games.

Cleaning the cache DNS and resetting network settings

Sometimes the slow internet is linked to the old ones. DNS-To throw them off:

1. Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Access point (APN);
2. Click on the three dots in the upper right corner and select Reset to default values;
3. Restart the device;
4. For discharge DNS Enter Termux (or through the ADB):

su


ndc resolver flushdefaultif




ndc resolver flushif wlan0




ndc resolver flushif rmnet_data

7. Extreme methods: modem acceleration and engineering settings

These methods require root rights and can cause the phone to malfunction. Use them at your own risk.

Change the modem configuration via Build.prop

Open the file. /system/build.prop (You need root and a file manager, such as Root Explorer, and add strings:

ro.telephony.default_network=22


persist.radio.lte_dc_enable=1




persist.radio.data_ltd_sys_ind=1




persist.radio.rat_on=combine

These parameters:

• Compulsoryly include load-bearing aggregation (LTE-DC);
• Optimize switching between networks;
• Improve the stability of the connection in roaming.

Installation of the modified modem

Some enthusiasts are assembling custom modems for Redmi 9 that work better with specific operators, such as the Redmi Note 9 modem (the merlin model) that can give you 10-15% speed boost.

1. Download the modem file (for example, modem_merlin.img);
2. Write it through Fastboot:

fastboot flash modem modem_merlin.img


fastboot reboot

⚠️ Warning: Incompatible modems can cause network loss or call inability.Before firmware, backup the original modem with the fastboot dump modem command.

FAQ: Frequent questions about improving the Internet on Redmi 9