How to connect and configure a case book on a Xiaomi smartphone: from selection to activation of functions

Xiaomi smartphone bookcases have long since ceased to be just an accessory, they have become a full-fledged element of the ecosystem that expands the functionality of the device. Magnetic lock, automatic screen awakening, display protection and even additional sensors in premium models make such cases indispensable. However, many users face problems: the phone does not respond to the closure of the case, lock functions work incorrectly, or do not manage to “friend” the accessory with the smartphone.

In this article, we will discuss all the steps from choosing a compatible case to fine-tuning its operation, paying special attention to the typical errors that interfere with the correct operation, and give specific recommendations for different models Xiaomi, Redmi and other products. POCO. If you just bought a book or plan to do so, here you will find the answers to all your questions.

It's important to understand that not all cases are equally useful: cheap ones can not only fail, but also damage the magnetic sensor of a smartphone, we will tell you how to check the originality of the accessory and what to do if after connecting there are malfunctions in the phone.

1. How to choose a case-book for Xiaomi: compatibility and key parameters

Before you plug in a case, make sure it's right for your Xiaomi model. Even minor differences in the location of magnets or cutouts can make the accessory useless.

• 📱 Accurate model match: Case for Xiaomi 13 Pro is not suitable for Xiaomi 13 due to different dimensions and location of cameras.
• 🧲 Magnet count and strength: The original Xiaomi cases use 4-6 neodymium magnets that securely lock the lid. Cheap counterparts often save on this, which causes the case to close poorly or fails to autolock.
• 🔄 Hall sensor: This is the one responsible for detecting the opening/closing of the case. In budget models (Redmi Note 12, POCO X5) sensor can be simplified - such cases require more accurate adjustment.
• 🛡️ Material and protection: Polyurethane leather covers (PU Leather) is cheaper but wears out faster.The original Xiaomi cases often have a microfiber backing that prevents scratches on the screen.

If you buy a case outside the official Xiaomi store, pay attention to reviews about compatibility with your model. 12T Xiaomi 12 covers are suitable, but only if they have the same magnetic lock location, 4PDA or Mi Community).

Counterfeit Warning: Non-original cases may contain too strong magnets that will eventually demagnetize the phone’s Hall sensor, which will cause even the original case to become unrecognizable. Check the strength of the magnets with a compass (on your phone) – if the arrow deviates by more than 30°, it's a fake.

2. Preparation of the smartphone: checking sensors and settings

Before you plug in the case, make sure your Xiaomi is ready for it. Many of the problems with the case are not related to the accessory itself, but to the phone settings or damaged sensors.

Step 1: Checking the Hall sensor

Hall's sensor is responsible for detecting the magnetic field of the case, to check its operation:

1. Open the Phone app and enter the code ##6484## (for new Xiaomi models, you may not be able to use an alternative method).
2. If the code doesn’t work, download the app. CPU-Z or AIDA64 And you can find the Sensors section, and when you bring the magnet up to the top of the phone (where the sensor is usually located), the value should change.
3. If the sensor doesn't respond, it's probably damaged, and then the case book won't work properly.

Step 2: Update the firmware

Old versions. MIUI (There may be cases recognition bugs below 12.5:

1. Go to Settings → About the phone → System update.
2. If an update is available, install it and restart the phone.

Step 3: Reset sensor settings

Sometimes it helps to reset sensor settings to factory:

1. Open Settings → System and device → Additional → Resetting.
2. Select Reset sensor settings (not to be confused with a full reset!).

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If after updating the firmware case stopped working, try to roll back to the previous version. MIUI. Sometimes new updates contain bugs that only fix the following patches.

3. Step-by-step instructions: how to connect a case-book to Xiaomi

Now, the connection process itself, and most of the time, the case doesn't require special activation, it has to work out of the box, but there are nuances for different Xiaomi models.

Universal Instructions (for all models):

1. Install the case on the phone: Carefully insert the smartphone into the case, making sure that all the cutouts (camera, connectors, speakers) match.
2. Close the case: When you first close the phone should emit a vibration or audible signal confirming the recognition of the case.
3. Check Autolock: Close the case - the screen should go out. Open - the screen should turn on (if the function is activated in the settings).

If the cover is not recognized:

• 🔄 Reboot your phone with a covered cover.
• 📱 Check whether the protective glass or film interferes with the work of the magnets (sometimes metallized films shield the field).
• ⚙️ Enable the function of Locking when closing the case manually (see the next section).

Some models (Xiaomi 13 Ultra, Mix Fold 3) may require additional adjustment due to the non-standard location of the sensors.

Check the location of the magnets in the case (should be in the top, next to the speaker)

Calibrate the Hall sensor through the engineering menu (#36446337###)

Make sure that there are no metal inserts in the case that interfere with the magnetic field.

Try another case to check the operability of the sensor-->

4. Configure the functions of the cover book in MIUI

Even if the case is physically connected, its functions can be disabled in the settings, so let's figure out where and what to turn on.

Where to find the settings of the case:

1. Open the Settings → Display.
2. Scroll down and find the Lock section when closing the case (in some versions) MIUI It can be called a smart lock or a case sensor).
3. Activate the switch next to the appropriate option.

Additional settings (depending on the model):

In some models (POCO F5, Redmi K60) These settings can be hidden to unlock them:

1. Activate Developer Mode (7 times click on the MIUI version in your phone settings).
2. Back to Settings → Additionally. → For developers.
3. Find the Force allow smart cover option and turn it on.

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If the case still doesn't work after all the settings are activated, the problem may be a hardware malfunction of the Hall sensor, in which case only the service center will help.

5. Common Problems and Their Solutions

Even after you have installed and set up the case, it can be incorrect, and we'll look at the typical situations and how to fix them.

Problem 1: The case is not recognized (the screen is not blocked)

• 🔍 Check if the case is properly installed – magnets should be on top of the phone.
• 📱 Make sure that the lock function when closing the case is enabled in the settings.
• 🔄 Reboot your phone with a covered cover.
• 🛠️ If nothing helps, try calibrating the Hall sensor through the engineering menu (#36446337##).

Problem 2: The screen spontaneously turns on in the case

• 📵 Check if there is another magnet near the phone (for example, from powerbank or headphones).
• 🔋 Turn off the function of lifting to wake up in Settings → Display. → Screen awakening.
• 🛡️ Update the firmware - in older versions MIUI There were bugs with false sensor alerts.

Problem 3: Case interferes with wireless charging

• ⚡ Use neckline cases for the coil of wireless charging (usually marked on the inside of the case).
• 🔄 Try flipping your phone over at the charging station - sometimes changing position helps.
• 📱 In the wireless charging settings (Settings) → Battery → Wireless charging) turn on the option Reinforced Mode (if available).

Problem 4: The cover wears out quickly or moves away

• 🧴 Use silicone lubricant for magnets (sold in electronics stores) – this will prolong the life of the magnet.
• 🔄 Clean the inside of the case regularly from dust and debris (they may scratch the screen).
• 🛡️ If the case began to move away, put a thin strip of double-sided tape in the places of fastening (without closing the magnets!).

⚠️ Warning: If the phone starts to overheat after installing the case, remove the accessory immediately! This may indicate a short circuit due to a damaged metal insert in the case).

6. Features of book cases for folding Xiaomi smartphones

Xiaomi foldable phones (Mix Fold 2, Mix Fold 3) require special cases that take into account the unique design of the device.

What you need to know:

• 📱 The case must support both folded and unfolded modes, and cheap counterparts often ignore the decomposed mode, which causes the screen to stay locked.
• 🧲 The magnets in the folding phone case are asymmetrically located – they can not be used on conventional smartphones.
• 🔋 Wireless charging may not work due to the thickness of the case.In this case, use the original charging dock from Xiaomi.

How to set up a case on Mix Fold 3:

1. Install the case on the phone in folded condition.

For the Mix Fold 2, additional sensor calibration may be required:

⚠️ Note: Do not use Mix Fold 2 cases on Mix Fold 3 – despite the similarity, the location of the magnets is different and this can cause damage to the sensor!

7. Alternatives to bookcases: what to choose if the standard option does not fit

If the cover book is not suitable for you (for example, due to inconvenience or compatibility issues), consider alternative options:

Magnetic-mounted covers (without locking function)

• 🧲 These cases are held on magnets, but they don't lock the screen.
• 💰 Cheaper than classic book covers (from 300 rubles).
• 📱 Examples: Spigen Thin Fit, Ringke Fusion-X.

2.Covers with support for Always On Display (AOD)

3. Smart cases with NFC and additional functions

• 📶 Can automatically run applications when opened (e.g. camera).
• 💳 Some models support contactless payment via a case (built-in) NFC-chip).
• 📱 Examples: Xiaomi Smart Cover Pro (for flagships only).

4. Homemade solutions

If you only need to lock the screen when closing, you can use:

• 🧲 Magnetic tag: Stick a small magnet to the inside of a regular case in the Hall sensor area.
• 📱 Emulator apps: For example, Smart Cover (requires root).

Before buying an alternative case, check its compatibility with your Xiaomi model. AOD They will not be able to use budget models (Redmi). 10A, POCO M5), Because they don't have a sensor.

8 Care Tips: How to prolong the life of a book case

A cover book is not only a protection for the phone, but also an accessory that needs care, the following recommendations will help to avoid premature wear:

1. Cleaning and storage

• 🧼 Once a week, wipe the inside of the case with a wet wipe (without alcohol!).
• 🚫 Do not store your phone in a case in places with high humidity (bathroom, kitchen) - this leads to skin detachment.
• ☀️ Avoid direct sunlight – the cover may burn out or deform.

Protection of magnets

• 🧲 Do not place your phone near strong magnets (columns, refrigerator) – this can demagnetize the sensor.
• 🔋 When wireless charging, remove the case if you notice the heating of the magnets.

3. Prevention of mechanical damage

• 📦 Do not bend the case when removing / installing - this leads to cracks in the seams.
• 🔄 If the case began to move away, do not pull it by force - carefully adjust the fasteners.

4. Replacement of worn-out elements

If the case is still good, but the magnets are weakened:

• 🛠️ You can replace magnets yourself (sold in shops for needlework).
• 📏 Use magnets with a diameter of 3-5 mm and a thickness of 1-1.5 mm.
• 🔧 Stick them with superglue (like Loctite) to avoid getting on plastic parts.

The average life of a good book case is 1.5-2 years, and if the case starts to spread at the seams or the magnets stop holding, it is better to replace it with a new one so as not to damage the phone.

⚠️ Warning: If after prolonged use of the cover on the screen of the phone there are scuffs or scratches, it means that the internal microfiber substrate was worn!

FAQ: Frequent Questions About Book Cases for Xiaomi