USB-OTG activation on Xiaomi Redmi Note 4X: the full guide

The Xiaomi Redmi Note 4X has been one of the most popular mid-range devices for several years, and many users still wonder about connecting peripherals. USB On-The-Go allows you to turn the gadget into a full-fledged hub to which you can connect flash drives, keyboards, mice and even game controllers. This is especially true for owners of a model with a Snapdragon 625 processor, whose energy efficiency allows you to work with external devices for a long time.

However, unlike many modern devices where external drive support works out of the box, there are nuances in the MIUI shell. Often users do not know whether you need to activate a special switch in the settings or the system itself recognizes the connected device. In this article, we will discuss in detail the configuration process, possible problems with the file system and how to solve typical errors.

It is worth noting that Redmi Note 4X supportive OTG You don't need to do it at the hardware level without having to flash the kernel, which makes it as safe as possible. ADB-It's enough to understand the logic of the Android file system and properly prepare the external device.

USB port features in Redmi Note 4X

The Micro-USB 2.0 port installed in this model is capable of delivering currents of up to 2.5 Amps, which is enough to power most flash drives and some external hard drives with its own power. It is important to understand that bandwidth is limited by the USB 2.0 standard, so the read and write speed will be lower than on modern flagships with USB 3.0. However, for watching video in Full HD or transferring documents this speed is more than enough.

The MIUI shell is based on Android, where OTG support is built deep into the system. Unlike older firmware versions, which required manually including a section in the Developer Menu, in current builds, this process is automated. The system itself determines the type of device connected and selects the appropriate driver. However, if you plan to connect specific hardware, such as Ethernet adapters or sound cards, additional settings may be required.

Energy is key, if you connect an energy-intensive external HDD without additional power, the smartphone may not detect it or will permanently turn it off. USB-It is also worth considering that when you are actively transmitting data, the battery is consumed faster, since the port operates in host mode.

Should I turn on OTG in the MIUI settings?

One of the most common questions you'll find on forums is, "Where do you find the OTG switch on the menu?" The answer may surprise other brands, but in the Xiaomi Redmi Note 4X, there's no separate "Enable OTG" button in the standard settings menu. The function is activated by default at the system kernel level. Once you plug in a compatible device, the operating system instantly responds to it.

Some older firmware or custom builds (like LineageOS or Resurrection Remix) may have had options in the Developer section. To get there, you have to click 7 times on the build number in the About menu. However, in the stock MIUI Global and China versions, this item is hidden because it is not required to work. If your device does not see the flash drive, the problem is not the missing switch, but the file system or cable.

Sometimes the system may request permission to access the USB-A pop-up will appear on the screen asking you to open the file manager or run a file application, and always agree to that request. If you accidentally clicked “Cancel”, reconnecting may not trigger the window again and the device will be ignored until the cache is rebooted or cleared. USB.

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In the Xiaomi Redmi Note 4X, the OTG function is enabled by default and does not require manual activation in the settings menu.

File system requirements and formatting

The key to working with external drives is the file system. Android, and MIUI in particular, “out of the box” perfectly read the formats FAT32 and exFAT. FAT32 format is the most compatible, but has a limit on the size of one file - it can not exceed 4 GB. If you plan to drop on the flash drive movies in high quality or game images, this format is not suitable for you.

The exFAT format is free of file size restrictions and is ideal for today’s high-capacity drives. However, if your flash drive is formatted into the NTFS file system (standard for Windows), the Redmi Note 4X can see it, but it can’t write data or even read it without third-party software, in which case it’s better to format the drive.

You can use a computer to format. Insert a flash drive in your PC, right-click on the disk and select "Format." In the File System field, select exFAT or FAT32. Leave the cluster size by default. After the process is complete safely, remove the device and connect to your smartphone.

Step-by-step instructions for connecting external devices

The connection process is as simple as possible and requires no special skills, the main thing is to use a high-quality adapter, since cheap Chinese adapters often do not have the necessary resistance on the contacts, which prevents the phone from going into host mode.

After you're physically connected, pay attention to the top of the screen «USB-Drive connected" or flash drive icon. If you use a file manager from Xiaomi ("Conductor"), then a new section will appear in the side menu or on the home screen «USB». By clicking on it, you will get access to the files.

If you don't connect a drive, but a gamepad or a keyboard, for example, the notification may not appear, but the device should work immediately. Game controllers do not require driver installation, support is implemented at the level of Android Input. Just run a game with support for gamepads, and control should switch.

In the rare cases where the device is not identified, try rebooting the smartphone with the flash drive already connected. USB-port and initialize the device, and it's also worth checking if the debugging mode is on. USB», which may sometimes conflict with the normal storage regime, although in the MIUI It's rare.

Working with file managers

The MIUI's regular Explorer tool has basic functionality that's enough to copy photos and music, but for more advanced work, like watching heavy video or working with archives, it's better to install a third-party app, with Total Commander or FX File Explorer being the leader in this field.

Third-party managers often have built-in codecs and plugins to work with LAN and USB. When you first run an application after you plug in a flash drive, it can request advanced permissions. Be sure to provide them, otherwise you can only see files, but not open or delete them. This is the security feature of Android 6.0 and higher, which is the basis of the firmware Redmi Note 4X.

To watch video in high bitrate (for example, 4K or heavy MKV files), the regular player may not cope. In conjunction with OTG, VLC for Android or MX Player players work perfectly well. They are able to hardware speed up decoding using the power of the Snapdragon 625 processor, which ensures smooth play without jerks.

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Use dual-panel file managers for easy file copying between internal memory and flash drive – this speeds up the process at times.

Typical problems and ways to solve them

Despite the simplicity, users can face a number of challenges — «USB-It can be caused by a power shortage, and if the flash drive flashes but the phone can't see it, try using an adapter with extra power or plugging in a lighter flash drive.

Another common error is a message about file system damage. Android may suggest formatting the drive.

⚠️ Note: If you agree to format, you will completely delete all data from the flash drive. Be sure to copy important information to the computer before this action.

Sometimes the problem lies in the Micro-USB port itself. In the Redmi Note 4X, the connector may shatter over time, and the data connection (Data+ or Data-) may disappear, although charging (VCC) will go, in which case careful cleaning of the port from dust with compressed air or replacing the socket in the service will help.

⚠️ Warning: Do not connect powerful external hard drives to your smartphone without your own power.This can cause a surge in current and damage to the power controller on the motherboard.

Frequently Asked Questions (FAQ)