Xiaomi Redmi 4X
2017
16/32GB of internal memory
microSD cards
USB-accumulator
OTG-adapter
In this article, we will analyze all the nuances: from choosing a compatible flash drive to setting up OTG-mode MIUI, Solving common bugs (e.g., "Device Unidentifiable") and security tips, and you'll also learn why some flash drives aren't identified on Redmi. 4X, Even if they work on other phones.
Let's just say: Redmi 4X It doesn't have a built-in USB-Type C, it uses an outdated Micro-USB 2.0 connector, which means you'll need to plug in a standard USB stick. OTG-adapter (or cable with support) USB OTG). Without it, the smartphone will not see the drive.
1.What flash drives are compatible with Xiaomi Redmi 4X?
Not every one. USB-A flash drive or microSD card will work correctly with Redmi 4X. Here are the key selection criteria:
- 🔹 File system format: the smartphone supports FAT32 (up to 32 GB), exFAT (up to 2 TB) and NTFS (Read only!!! - Choose exFAT for full-time work.
- 🔹 Memory: maximum supported volume – 256 GB (for microSD) and 1 TB (for microSD) USB-However, in practice, drives up to 128 GB are more stable.
- 🔹 Read/write speed: for comfortable work, choose flash drives with a class UHS-I (U1/U3) speed 10 MB/s.
- 🔹 Brand: Preference to trusted manufacturers — SanDisk, Kingston, Samsung, Transcend. Cheap no-name drives often cause errors.
Pay special attention OTG-Cheap adapters from China may not provide enough power to power the flash drive, causing the smartphone to emit an error"USB-Device not identified. Better to choose an adapter with built-in cable (e.g. Xiaomi) OTG Cable) or a powered model (if you plug in a hard drive).
Redmi 4X does not support USB 3.0/3.1 – even if your USB drive is compatible with these standards, it will run at USB 2.0 speeds (up to 480 Mbps).
Why are some flash drives not defined?
2. What will it take to connect the flash drive?
To insert the flash drive into the Redmi 4X, prepare the following:
- 📌 USB-flash drive (formatted in exFAT or FAT32).
- 📌 OTG-Adapter with Micro-USB (Male) connector) → USB-A (Female).
- 📌 Charger (optional if the flash drive requires a lot of energy).
- 📌 File Manager (embedded Explorer or third-party, such as Solid Explorer).
If you use a microSD card, then you do not need an adapter - just insert it into the tray (located on the left side of the smartphone, next to the slot for the device). SIM-However, for full-size USB-flash-drive OTG mandatory.
⚠️ Attention, not all OTG-Adapters are equally useful. Avoid thin-wire models, which often break when you plug in heavy-framed flash drives (like the SanDisk Ultra Fit), and the best option is an adapter with an angled connector that will not interfere with holding the phone in your hand.
1. Check the file system format of the flash drive (exFAT/FAT32)
2.Make sure that OTG-Adapter is good (try on another device)
3. charge the smartphone at least 30% (at low charge, the OTG may not work)
4. Close all background applications (especially games and instant messengers)
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3. Step-by-step instructions: how to insert a flash drive in Redmi 4X
Follow this algorithm to connect USB-flash-drive:
- Step 1. Insert. OTG-Adapter to the Micro-USB smartphone connector. Make sure the connection is tight - backlash can lead to loss of contact.
- Step 2: Connect the flash drive to the adapter. If you use a microSD, insert it into the tray (switching off the phone beforehand!).
- Step 3. Wait for the notification"USB-The device is connected. If it's not there, check it: 🔋 Status. OTG-Adapter (Try another one). 🔌 Power – Some flash drives require a charging connection. 📱 Version MIUI (Upgrade to the last stable).
Step 4. Open Explorer (Folder icon on desktop) → Go to section"USB-accumulator".
Step 5: Copy or move files (hold your finger on the file → Copy / Cut).
Note: If the flash drive does not appear in Explorer, try:
- Reboot the smartphone with a connected drive.
- Format the flash drive on the PC in exFAT.
- Use a third-party file manager (e.g., FX File Explorer).
⚠️ Attention! Do not remove the flash drive during file transfer, this can lead to data corruption. Always use the Safe Retrieval function (icon) USB notification-bar →"Shut down").
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If the flash drive is detected, but the files are not copied, try connecting the smartphone to charging. OTG-adapters do not provide sufficient current for simultaneous operation of the drive and screen.
4. Typical errors and their solutions
Even with the right connection, Redmi 4X users are experiencing errors.
| Mistake. | Possible cause | Decision |
|---|---|---|
| USB-device not identified | Lack of nutrition, incompatible format | Use OTG powered or format the flash drive in exFAT |
| The flash drive connects but does not open. | A damaged file system | Check on PC via chkdsk (Windows) or Disk Utility (Mac) |
| The smartphone overheats when connected | High load on the processor | Close the background applications, reduce the brightness of the screen |
| OTG is not supported | OTG disabled in settings | Include in Settings → Additional → OTG |
If none of the solutions worked, try resetting your smartphone settings (but back up first!) In a pinch, the problem may be physical damage to the Micro-USB connector - in which case repairs will be needed.
Tip: If you connect flash drives frequently, install the USB OTG Checker app from Google Play, which will show if your device supports OTG, and test the data rate.
5. How to transfer files from the flash drive to Redmi 4X?
Once you successfully connect the flash drive, you can manage files through standard Explorer or third-party applications.
Method 1: Standard Conductor
- Open the "Conductor" application (the folder icon on the desktop).
- Go to section"USB-drive" (usually displayed at the top of the list).
- Hold your finger on the file/folder → select Copy or Cut.
- Return to the root directory → select the destination folder (such as “Downloads”) → “Insert”.
If the disk is not detected, try connecting it through USB-powerhouse.