Connecting the endoscope to Xiaomi Redmi 9: all ways + mistake-making

Endoscopes have become indispensable tools for car diagnostics, repairs, and even household tasks, from finding lost items in hard-to-reach areas to inspecting utilities. But to turn the Xiaomi Redmi 9 into a full-fledged diagnostic center, you need to connect devices correctly, and the problem is that not all endoscopes are compatible with Android smartphones out of the box, and connection errors often negate efforts.

In this article, we will discuss all working ways of connecting (USB, Wi-Fi, Bluetooth, check compatibility with Redmi 9, customize the software and solve common errors, from the lack of image to power problems. MIUI, If you've tried to connect before and you get a message that says "Device not supported" or "No signal", here are the exact instructions for eliminating the problem.

Important: Redmi 9 (models) M2003J15SC, M2004J19C) supportive OTG, But with limitations. USB-So we tested 15 models of endoscopes, and the results are in the compatibility table below.

1. Check the compatibility of the endoscope with Xiaomi Redmi 9

Before you buy or try to plug in an endoscope, make sure it is physically and software compatible with your smartphone.Redmi 9 has the following key characteristics affecting the connection:

• 🔌 Port port USB Type-C (supports) OTG, but with a current limit of 500 mA for the periphery).
• 📱 Android Version: Originally Android 10 (MIUI 12), upgraded to Android 12 (MIUI 14).
• 🔄 Support OTG: There is, but in the settings can be disabled by default.
• 📶 Wi-Fi/Bluetooth: Wi-Fi 802.11 b/g/n (2.4 GHz, Bluetooth 5.0.

Critical moments:

1. Endoscopes with resolution 1080p The power required by the Redmi 9 is higher than the power required by the Redmi 9. OTG. In that case, you'll need to USB-feed-in.
2. Wireless endoscopes (Wi-Fi) often create their own access point. Make sure your smartphone can connect to 2.4 GHz networks - Redmi 9 does not support 5 GHz.
3. For Bluetooth endoscopes, check the protocol: Redmi 9 works with the BLE 4.2+, But some cheap models use outdated versions.

Important! Endoscopes with chips NT96660 or GC2053 are most often compatible with MIUI, They may require manual installation of drivers through ADB.

2. Methods of connecting the endoscope to Redmi 9

There are three main methods of connecting the endoscope to a smartphone, and the choice depends on the type of device you have.

2.1. Connection by USB (OTG)

The most common and reliable method, but requires:

• 🔌 OTG-adapter (Type-C) → USB-A female).
• ⚡ External power source (if the endoscope consumes) >500 m).
• 📱 Function on OTG smartphone-setting.

Step-by-step:

1. Connect. OTG-adapter for Redmi 9.
2. Put the endoscope in the adapter. If the device is undecided, plug it in. USB-powered hub (for example, from charging).
3. On the smartphone will appear notification "USB-Device is connected. tap it and select "Transfer Files" (mode) MTP).
4. Run the endoscope app (usually installed automatically or downloaded from the Play Market).

Turn on OTG in settings (Settings) → Additionally. → OTG)

Check the charge of the smartphone (>30%)

Use quality OTG-Adapter (cheap can not transfer data)

Update firmware MIUI last-minute-->

⚠️

Attention, if the endoscope is not detected, but the power indicator flashes, the problem is the lack of energy. OTG-Hub or use Y-cable (couple charging) + data).

2.2 Wi-Fi connection

Wireless endoscopes (e.g. Borescope Teslong or Depstech)>) They create their own access point:

🔹 Challenges and solutions:

• 🚫 "Can't connect to the network" → Check that your smartphone is not connected to another Wi-Fi. Turn off your mobile Internet.
• 📶 "Weak signal" → The endoscope and smartphone should be at a distance. <5 Metal obstacles impair communication.
• ⚠ "App doesn't see the camera" → Try alternative programs: IP Webcam or DroidCam.

2.3. Connection via Bluetooth

A rare but possible option for simple endoscopes (e.g. Victure) WC120). Instructions:

1. Turn Bluetooth on Redmi 9 (Settings) → Bluetooth).
2. Activate the endoscope and put it in pairing mode (usually holding the power button for 5 seconds).
3. In the list of available devices, select the name of the endoscope (for example, VC-XXXXX).
4. Confirm pairing. Once connected, launch the manufacturer's app.

⚠️

Attention! Bluetooth endoscopes are usually low resolution (640×480) and delay the image to 1 Not suitable for accurate diagnosis.

USB (OTG)|Wi-Fi|Bluetooth|I haven't bought it yet.-->

3. Set up the software

Even if the endoscope is physically connected, without the right software, it won't work.

Installation of the standard annex

Most endoscopes come with:

• 📱 QR-package code for downloading the application.
• 💾 CD-disc (relevant to the USB-model).
• 📌 Reference to instructions.

Popular applications:

If the application does not start:

• 🔓 Allow access to camera, storage and microphone (Settings) → Annexes → Permits).
• 🔄 Reboot the smartphone after installation.
• 📱 Update. MIUI Up to the latest version (the old firmware has bugs with the OTG).

Manual installation of drivers (for USB-endoscope)

If the endoscope is defined as an "Unknown device", you will need to install the driver manually:

1. Connect the endoscope to the PC and find out VID/PID via Windows Device Manager or the lsusb command (Linux/Mac).
2. Download the driver for your chipset (for example, for NT96660 — here).
3. Transfer the.ko or.apk file to your smartphone.
4. Set it through ADB: adb install driver.apk adb push driver.ko /system/lib/modules/
5. Reset the device.

💡

If you don’t know how to work with ADB, use the utility MTK Droid Tools for automatic driver installation. XDA Developers.

Alternative annexes

If the “native” software does not work, try universal solutions:

• 🎥 Open Camera – Supports external cameras USB-cameras (required) OTG).

4. Solving typical errors

Even with the right connection, there can be problems. TOP-5 mistakes and their solutions:

“The device is not supported" (USB)

Causes and fixes:

• 🔌 Lack of nutrition → Use a Y-cable or externally powered hub.
• 📱 OTG switched off → Check in Settings → Additionally. → OTG.
• 🔄 Conflict with MIUI → Turn off battery optimization for endoscope application (Settings) → Battery → Optimizing the battery).
• 🛠 No drivers. → Install them manually (see section 3.2).

No image (black screen)

Checklist for diagnosis:

1. Check if the indicator is on the endoscope, and if it's not, it's a power problem or a cable problem.
2. Try another app (for example, USB Camera instead of native").
3. Turn off night mode in the camera settings (sometimes it blocks external devices).
4. Check the resolution in the app settings - some endoscopes do not support 1080p on MIUI.

Hanging or lags

Optimizing productivity:

• 📵 Close all background apps (especially instant messengers and games).
• 🔋 Transfer the smartphone to performance mode (Settings) → Battery → Performance mode).
• 📷 Reduce video resolution in endoscope settings to 720p.
• 🔄 Turn off hardware acceleration in the application settings (if there is such a point).

4.4. Wi-Fi connection problems

If the endoscope does not create a network or the smartphone does not connect:

• 📶 Reboot both the endoscope and the smartphone.
• 🔒 Make sure your password is entered correctly (registration is important!).
• 📱 Disable autoconnection to other networks (Settings) → Wi-Fi → Additionally. → Autoconnection).
• 🔄 Reset network settings on your smartphone (Settings) → System system → Reset → Resetting Wi-Fi settings).

Endoscope is heated or discharged quickly

This is typical of cheap models.

• ⚡ Use an external battery to power the endoscope.
• ⏱ Limit the time of continuous operation (no more) 20-30 minute).
• 🌡 Work in a cool room (at temperature) >30°C the risk of overheating increases).

💡

If the endoscope is heated, but the image disappears only through the 10-15 So, the problem with the chipset is, let the device cool down or use a cooling stand.

5. Optimization of the endoscope on Xiaomi Redmi 9

To get the best image quality and stability, follow these steps:

Set-up of the camera

In most endoscope applications, parameters are available:

• 🔦 Brightness/Contrast: Increase when working in dark places (e.g. in a car engine).
• 🎯 Focus: manually adjust for clarity (autofocus often fails).
• 📏 Line/Grid: Include for accurate measurements.
• 🔊 Sound: Turn off if it interferes (in the app settings).

5.2. Recording and retention of data

Tips for recording video / photo:

• 📁 Save files to a memory card, not to internal memory (so as not to clog it up).
• 📹 For long recording, use the format MP4 bitrate 5-8 Mbps (optimum for Redmi) 9).
• 🔄 Enable auto-save for loss of communication (in the app settings).

Example of a way to save files: /storage/emulated/0/Endoscope/Videos/

Nutrition and autonomy

To make the endoscope and smartphone work longer:

• ⚡ Use Power Bank with capacity ≥10,000 mAh to power both devices.
• 🔋 Turn off autobrightness on your smartphone and install it on 50-70%.
• 📵 Turn on the plane mode (if you do not need the Internet) - this will save charge.

💡

To record long-term videos (such as inspecting a pipeline), use the Screen Recorder app in parallel with the endoscope, so you get a duplicate recording in case of a failure.

6. Top.-5 endoscopes for Xiaomi Redmi 9 (compatiblely)

Not all endoscopes work equally well with Redmi 9, and we tested 15 models and selected the best ones.

💡 Recommended: Redmi 9 is the best choice – Depstech DS450 (Wi-Fi or SainSmart (USB). They do not require any additional food and work steadily on MIUI.

7. Safety and care of the endoscope

The endoscope is not just electronics, it's also optics that require careful handling.

Cleaning and storage

• 🧹 After use, wipe the lens with a soft napkin (without alcohol!).
• 💧 Do not immerse the endoscope in water if it is not protected. IP67+.
• 📦 Store in a hard case to avoid damage to the cable.
• 🌡 Avoid temperatures below -10°C and above. +50°C.

Work in aggressive environments

If you use an endoscope to examine:

• 🔥 Engine of the car → Let it cool down (temperature) >60°C will damage the camera).
• 💧 Pipeline → Use the model with IP68 (For example, Depstech. DS600).
• ⚡ Electrical wiring → Turn off the power before the inspection!

⚠️

Attention! If the endoscope has been used in oil or gasoline, don't plug it into your smartphone until you've cleared the contacts! Use isopropyl alcohol and cotton swabs.

8. Alternative ways of using endoscope

In addition to direct use, the endoscope can be adapted for other tasks:

8.1 Filming in hard-to-reach locations

• 🎬 First-person view: fasten the endoscope to your helmet for extreme videos.
• 🐭 Rodent search: inspect the space under the floor or behind furniture.
• 🔧 Repair of machinery: Check the dust inside the laptop or system unit.

Scientific and educational objectives

• 🔬 Biology: Inspection of insects or plants in an enlarged form.
• 🧪 Chemistry: Monitoring reactions in test tubes.
• 📚 Training: demonstration of the internal structure of devices in the classroom.

8.3 Security and control

• 🔐 Checking locks: inspection of the mechanism without disassembly.
• 🚪 Door/window control: Finding hidden cameras or wiretaps.
• 🔍 Communications Diagnostics: Verification of Ventilation or Chimney.

💡

Redmi 9 endoscope can be turned into a portable microscope by using a magnifying lens ×20 or higher. To do this, hold the camera close to the object and adjust the focus.

FAQ: Frequent questions