How to unlock and configure memory card access on Xiaomi Redmi: the full guide 2026

Have you inserted a microSD into a Xiaomi Redmi smartphone, but the system doesn't see it, or does it ask you to format it? Or is the card detected, but applications can't write files to it? The problem is familiar to many owners of devices on MIUI — especially after updating the firmware or resetting. In this article, we will discuss all the ways to open access to the memory card, including hidden settings, fixing mounting errors and bypassing manufacturer restrictions.

It is important to understand: Xiaomi artificially restricts the work with external drives in some models (for example, in Redmi Note). 11 or Redmi 9A). This is due to Google’s security policy and file system features. F2FS/exFAT. We will show you how to get around these restrictions without root rights, and what to do if the card is determined as damaged or requires formatting in the system. FAT32 (It had previously worked normally).

Why Xiaomi Redmi doesn’t see a memory card: the main reasons

Before trying to “unblock» SD-Check the hardware and software causes of the problem, and 60 percent of the time, the problem is not the settings, it's the physical factors:

• 🔋 Poor contact: oxidation or contamination of the slot pins (especially relevant for Redmi) 8A Redmi 7 with side slot).
• 📱 Incompatible file system: MIUI It only works correctly with FAT32 (up to 32 GB) or exFAT (over 32 GB). NTFS or ext4 not mounted.
• 🔄 Firmware conflict: after update MIUI 13→14 Some Redmi Note 10 Pro users reported resetting access rights to the SD.
• 🛠️ Hardware malfunction: damage to the card controller or slot in the phone (for example, after a fall in the phone).

If the card previously worked on the same phone, but Suddenly is no longer defined, first try to reboot the device — in 20% of cases, this solves the problem of temporary “hang” mounting.

Method 1: Formatting a memory card through MIUI settings

The most reliable way to unlock a card is to format it directly in your phone, which will delete all the data, but it is guaranteed to solve the mounting problems, and it is important that you only use this method if there are no critical files on the card or you have previously made a backup.

Instructions for MIUI 12/13/14:

1. Go to Settings. → Memory. → Memory card (or Settings) → Warehouse → SD-map).
2. Click on your card name (e.g. SanDisk 64GB).
3. Select Format → Format as internal memory (if you want to expand your phone’s memory) or Format as portable (if the card is used as a removable drive).
4. Confirm the action. It'll take 1-3 minutes.

Once formatted, the card will be automatically mounted. If the system offers to transfer data (photos, music, documents) to SD, agree only if the card is at least A1 or A2, otherwise the phone will slow down.

Make a backup of important data from the card to the PC

Check that the card is not protected from writing (slider on the adapter in the position "unlock")

Make sure the battery is >30% (in case of a long process)

Use the original microSD adapter (not cheap adapters)

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Method 2: Configure access rights for applications

A common situation: the card is visible in Explorer, but applications (such as Gallery or Camera) cannot save files to it, due to MIUI permissions, which are reset after updates.

How to fix it:

1. Open Settings → Applications → Application Management.
2. Select the application you want to access (such as the Camera).
3. Go to Permits. → Memory.
4. Activate the switches Read from the memory card and Write to the memory card.
5. For some applications (such as WhatsApp), you also need to manually specify the save path in the settings of the application itself.

If the option to write to a memory card is inactive (grey), it means that the card is formatted as internal memory, in which case the rights are controlled by the system, and you can not change them without root rights.

Method 3: Correction of mounting errors via ADB

If the card is determined in the settings, but not mounted (writes "SD-The card is corrupted" or "Unknown file system ", you can try to force it to mount through the ADB (Android Debug Bridge is suitable for advanced users.

Step-by-step:

1. Install ADB Tools on your PC.
2. In your phone, activate Settings → About Phone → MIUI version (click 7 times to turn on Developer Mode).
3. Return to Settings → Additional → For developers and enable USB debugging.
4. Connect the phone to the PC and perform:

adb shell


sm list-disks




sm partition disk:XX,XX private

Where XX,XX is your card ID (recognize it by sm list-disks). Once done, restart your phone. The card should be mounted as internal memory.

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If the sm partition command returns the "Operation not allowed" error, the manufacturer has blocked this function. Try formatting the card in FAT32 via a PC using the SD Formatter program (the official tool from the SD Association).

Method 4: Bypassing MIUI restrictions for exFAT cards

Many Redmi Note 11 Pro+ and Redmi K50 users are faced with MIUI refusing to work with exFAT cards, even though they are formatted correctly, due to the lack of an exFAT license in some regional firmware.

• 🔄 Refuse the phone to the European or European version MIUI (for example, MIUI EU).
• 📱 Use the map FAT32 (32 GB maximum – reliable but inconvenient for large volumes.
• 🛠️ Install the exFAT patch through Magisk (requires root rights).

For flashing:

1. Download Fastboot firmware for your model from Xiaomifirmwareupdater.com.
2. Use the Mi Flash Tool to install (instructions on the site).
3. After the firmware, reset the settings (Settings → Additional → Resetting).

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Flashing removes all data from your phone, including photos and apps. Pre-backup through Settings → About Phone → Backup or Mi Cloud.

Compatibility table of memory cards with Redmi models

Not all memory cards work equally well with Xiaomi Redmi, and below are the compatibility data of popular models of cards with different devices (based on user tests):

If your model is not listed in the table, focus on the speed class: to record 4K video you need A2/UHS-II, for photos and music, Class 10 is enough. UHS-III cards will not give you an increase in speed due to the limitations of the controller in the phone.

What to do if your memory card is identified as damaged

Message "SD-The map is damaged. Try formatting it, it can even appear on a new map:

• 🔌 Incorrect extraction (without "Safe extraction" in the MIUI).
• 🖥️ Viruses that damage the file system (especially if the card was used on a PC).
• 🔋 Controller failure (card dies) – a common problem in cheap no-name drives).

Algorithm of action:

1. Check the card on your PC via CHKDSK: chkdsk E: /f (where E: is the letter of your card).
2. If it doesn’t work, format your card in FAT32 via SD Formatter (don’t use the standard Windows format!).
3. Try the card on another device, and if it doesn't work there, throw it away (recovering data from damaged cards is often pointless).

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To recover data from a damaged card, use PhotoRec (free) or R-Studio (paid, but more efficiently).

FAQ: Frequent questions about working with memory cards on Xiaomi Redmi

If none of these methods worked, check the card on another device or contact Xiaomi’s service center. In rare cases, the problem lies in damage to the memory card slot (for example, after a phone drops).