Recording the conversation on Xiaomi Redmi Note 9 Pro: hidden features and settings

Xiaomi smartphone owners often face the need to capture important information voiced by the interlocutor during the call. the Redmi Note 9 Pro, despite its age, remains popular due to the balance of price and functionality, but the software limitations of MIUI can hide some useful options. the built-in voice recorder and standard call functions often do not work as expected by the user, requiring a deep dive into the settings.

There are several ways to activate a conversation record, from using standard system tools to implementing third-party applications through ADB. Understanding the Android architecture on the MIUI shell will allow you to choose the most suitable method that will not conflict with security updates. It is important to note that in different regions of the firmware (Global, China, EEA) functionality may differ.

In this article, we’ll take a look at all the methods available, including hidden engineering menus and custom module installations, learn how to set up automatic recording, select sound sources, and bypass the restrictions imposed by Google’s privacy policies, and help turn your smartphone into a powerful tool for documenting conversations.

The MIUI system's regular capabilities for recording calls

The first thing to start with is to check the basic functionality that developers already put in the phonebook. Most of the time, the Redmi Note 9 Pro pre-installed the standard MIUI Dialer shell, which has a built-in audio capture mechanism, but it is often disabled by default or hidden depending on the regional version of the firmware installed on the device.

To activate, you need to open the Phone app and go to settings by clicking on three dots or a gear in the corner of the screen. If there is a Call Record option on the menu, you are lucky: you can turn on automatic recording for all numbers or select specific contacts. Automating the process will save you from the risk of forgetting to manually press the button at a critical time of the conversation.

In some versions of the firmware, the functionality is limited to manual recording only, in which case a button with a voice recorder will appear on the screen during the time, pressing it starts a process, which the interlocutor can notify the voice message if such an option is activated in the privacy settings.

It should be noted that the sound quality when using regular tools depends on the chosen codec. By default, the system can use compression, which worsens speech intelligibility, especially in conditions of poor network coverage. Switching to a higher quality codec in the settings can solve the problem of the quiet voice of the interlocutor.

Activation of hidden functions through the engineering menu

If you don't have the ability to set up a record in the standard menu, you can use a hidden engineering menu that is accessible through a special code, which allows you to access deep system settings of the Redmi Note 9 Pro, which are not visible to the average user. Be careful: changing unknown parameters can lead to unstable operation of the communication module.

To enter the menu, you need to open the Phone app and dial the code ##3646633##. Once you enter the last character, the Engineer Mode interface will open. You need to go to the Hardware Testing tab, then select Audio and Audio Debug. This section contains the settings for routing the audio stream.

⚠️ Attention: Making changes to the engineering menu may result in resetting the audio settings or loss of communication.

Inside the Audio Debug menu, you need to find a section associated with Voice Call or Record, where you can force recording support to be enabled even if it was blocked software in your region. However, in modern versions of Android (10 and above), access to these features is often closed at the kernel level, and sliders can be inactive.

Alternative paths through codes can vary depending on the version of MIUI. Sometimes code ##4636## opens the test menu, and there are additional options in the "Phone Information" section, but they are more often related to network settings than recording audio. However, checking these sections is a must for a full diagnosis of your device's capabilities.

Use of third-party applications and circumvention of restrictions

When the built-in tools are powerless, third-party solutions from Google Play come to the rescue. Apps like Cube ACR, Automatic Call Recorder or Call Recorder - SKVALEX are able to intercept audio streams at a deeper level than a standard call, they create a virtual mixer that records systems and microphones simultaneously.

Installing these apps on the Redmi Note 9 Pro requires advanced permissions. Once installed, you’ll need to allow access to your microphone, contacts, phone, and, critically, run a dedicated accessibility plugin. Without this plugin, the app won’t be able to “hear” the other person due to Android security limitations.

However, since Android 10, Google has closed direct access to the audio stream for third-party applications, which means that even the best programs can only record your voice, and the interlocutor will be heard very quietly or through the speaker. To get around this, you need to select the source of the audio from the recorder application and turn on the hands-free mode if the quality remains unsatisfactory.

Some applications offer their own dialing mode, in which case calls are made not through a standard "bell ringer", but through the recorder interface, which guarantees high quality recording, but changes the user experience, requiring addiction to the new dialing interface.

Customization of sound quality and save formats

The quality of the recorded dialogue is a key parameter to look at when setting up. Standard recording settings often choose the AMR format, which provides a small file size but low legibility. For important negotiations, it is better to switch to MP3 or WAV format, if this is possible with the chosen recording method.

In recorder applications, you can adjust the bitrate and sampling frequency. The optimal value for voice is considered to be 44.1 kHz or 48 kHz with a bitrate of 128 kbit / s. Higher values will lead to a rapid filling of memory Redmi Note 9 Pro, without giving a tangible increase in speech quality.

It is also important to adjust the sound source correctly. If you use a third-party app, display with the Mic, Voice Call and Camcorder settings. Often it is the switch to Camcorder mode that allows you to capture the sound of the system mixer, bypassing Android locks on the recording of a phone call.

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For maximum clarity, use a headset in noisy locations. Many recorders work better when an external microphone or Bluetooth headset is connected, as this changes the route of the audio stream.

Remember to check the records folder regularly. Files can accumulate and take up significant space in the Memory section. Setup to automatically clean old records or sync with cloud storage will help avoid overflowing the drive.

Solving problems with the lack of sound of the interlocutor

The most common problem with recording on modern Xiaomi smartphones is that you don't have a voice in the file, and you hear yourself perfectly, but you hear silence or a barely discernible whisper, because Android blocks direct access to the audio channel to protect user privacy.

One solution is to use a special plugin for recording applications that is installed via a computer using ADB (Android Debug Bridge), which requires the inclusion of USB debugging in the Developer menu. Once you connect to a PC and execute the plugin installation command, the application receives system rights to capture audio.

If you don't want to mess with ADB, you can try to turn on speaker while you're talking, and then you'll be able to output the speaker's sound and capture the main microphone of the phone, and the quality will be lower, with echoes and noises, but the information will be stored. Some recorders can automatically turn on speaker when you start recording.

⚠️ Attention: Using hands-free to record can be uncomfortable in public places and reduces battery life due to increased speaker power consumption.

It's also worth checking the noise cancellation settings. Aggressive noise cancellation MIUI can perceive the voice of the interlocutor as background noise and cut it out. Try turning off the "Sound Improvement" or "Noise Reduction" function in the audio settings or in the call app itself, if this option is available.

Legal aspects and retention of records

Before you start recording conversations, it is important to understand the legal side of the matter. In the Russian Federation, recording your own conversation, where you are a participant, is usually allowed for personal use. However, distribution, publication or transfer of the recording to third parties without the consent of the interlocutor may violate the law on the protection of personal data and confidentiality of communications.

Record files on Redmi Note 9 Pros are usually saved in a folder /MIUI/sound_recorder/call_rec/ Or in the root directory in the CallRecord folder. For easy access and sorting, it is recommended to use file managers with a date sorting function. It is important to ensure the security of these files by setting a password to the folder or using the built-in Hide Files feature in the Explorer. MIUI.

Regular backup is a critical procedure: When you reset or flash your device, all local data will be destroyed. Set up automatic synchronization of your record folder with Google Drive or Yandex.Disk so you can access the archive even after you lose your phone.

Frequently Asked Questions (FAQ)

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MIUI's regular tools provide the best quality, but may not be available in your area. Third-party applications are a versatile solution, but require fine-tuning to capture the voice of the interlocutor.