Buying Xiaomi Redmi from hand: what to check

The used electronics market is booming, and buying a Xiaomi Redmi or Poco smartphone is a great way to save money by getting a device with flagship characteristics for half the price. However, the ecosystem of Chinese manufacturers has its own characteristics that can turn a bargain into a headache if you do not conduct a thorough diagnosis before transferring money.

Unlike buying a new gadget at retail, where you get a sealed box and warranty, a hand-to-hand deal requires the buyer to be vigilant and know the specific nuances of MIUI and HyperOS. You will have to check not only the physical condition of the case, but also hidden software locks, the history of replacement components and the status of accounts.

In this article, we will discuss a step-by-step algorithm that will help weed out problematic devices and find a really high-quality device. We will touch on the issues of checking the originality of spare parts, the state of the battery and, most importantly, the lack of locks that can make a smartphone a useless brick.

External inspection and condition of the hull

The first thing that you start with is a close visual inspection, and even if the vendor claims that the gadget was worn in the case, micro scratches and scuffs on the frame can give you a real attitude to the technology.

Pay special attention to the screen. On the display off, under bright light, deep scratches are often visible that can interfere with view. On the device on, check for the uniformity of the backlight and no spots. If there is a crack on the screen, even a small one, this can be a sign that the device was falling, and the impact could damage the internal components.

• 🔍 Check the charging connectors and headphones for the presence of oxidation or backlash.
• 🔍 Check the density of the adjoining back cover and tray for SIM-map.
• 🔍 Evaluate the state of the glass cameras – scratches on them will spoil the quality of the photo.

Feel free to ask questions about whether the phone has been opened before.If you see signs of screws unscrewing or glue layer depressurization, it's a bargaining ground or a deeper check. Xiaomi often uses complex mounting systems, and poor-quality repairs in the past could have compromised dust protection.

⚠️ Warning: If the back cover is moving away or has a strong backlash, this may indicate a bloating battery.

Diagnostics of the display and sensor

The screen is the most expensive and vulnerable component of a smartphone. When buying a used device, it is critical to make sure that the display is original and has no “dead zones.” Xiaomi’s diagnostics menu has built-in tools for checking, but you can do it manually.

Try dragging the app icon around the screen, and if the icon sticks or the cursor twitches in some area, the sensor is damaged, and check the Multi-touch by running a game or gallery and trying to control several fingers at once.

Notice the color and viewing angles. If the phone tilts invert colors or turns yellow/blue, it may have been a cheap one. Xiaomi's original AMOLED and IPS arrays keep the color stable.

• 🎨 Check for burn-in on white background – traces of static icons.
• 🎨 Evaluate the operation of automatic brightness adjustment when changing lighting.
• 🎨 Make sure the frequency of the update is (90/120 Hz) runs smoothly without jerking.

Often, vendors hide pixel defects by installing dark wallpapers. Ask them to turn on a white image at full brightness, so you'll immediately see broken pickles or uneven backlights. This is especially true for models with LCD arrays, where edge lights are a common problem.

⚠️ Warning: If a seller refuses to remove the screen screen screen screen screen protection, it may be a sign that cracks or glued glass are hidden under the film).

Checking the battery and charging system

Battery condition is one of the main factors affecting smartphone comfort. used devices often have a worn-out battery that discharges quickly or unpredictably shuts down in the cold. MIUI does not have a built-in cycle counter in the available menu, but there are indirect signs.

Ask the seller to show the battery usage statistics in the settings. If the discharge schedule has sharp jumps (for example, from 40% to 10% in 5 minutes), this is a sure sign of degradation of the element’s chemistry. Also pay attention to screen time (Screen On Time) – for a healthy modern smartphone, 5-7 hours of active use are considered the norm.

Be sure to check the fast charging. Connect the original (or certified) power supply and look at the lock screen. Quick charging animations (such as the Mi Turbo Charge or Quick Charge) should appear. If the phone charges slowly, the problem may be in the power controller or the battery itself.

• 🔋 Touch the back cover while charging - strong heating indicates problems.
• 🔋 Check if the phone is holding the charge on standby (percentage should not fall on its own).
• 🔋 Make sure the cable sits tightly in the connector and does not fall out when moving.

You can use third-party apps like AccuBattery to make a more accurate diagnosis, but they take time to work, so when you meet quickly, be mindful of the device's behavior: if it turns off at 15-20% charge, it's time to change the battery.

Cameras, speakers and microphones

Multimedia capabilities are something we love about smartphones, and checking cameras should not only involve testing all the modules (width, TV, macro), but also finding artifacts, and taking a few shots of a white sheet of paper or wall to help detect dust on the matrix or scratches on the inside of the lenses.

Record the video with the stabilization enabled and walk around the room. The image should not twitch or "swim." Also check the autofocus: it should work quickly and clearly, without the characteristic buzzing or " yaw" back and forth. In Xiaomi's optical stabilization (OIS) models, the camera can shake slightly when it starts up - that's normal, but when shooting, the shaking should be compensated.

The sound system also requires checking. Turn on the music at maximum volume, the speaker should not wheez or make extraneous sounds. To check the microphone and the speaker, the best way to do this is to make a test call to someone you know or to the time service number.

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When checking the cameras, be sure to wipe the lenses before the test, and often "muddy" photos are the result of greasy fingerprints, not a defect in optics.

Don't forget to check the vibrator. In the sound settings, select different types of vibrations. The motor should work smoothly, without rattling and extraneous noise, which often occurs after falls or moisture.

IMEI, originality and status of the device

One of the most important steps is to check that the device is legal. IMEI on the box, in the settings of the phone (Settings) → On the phone and on the tray SIM-The discrepancy may indicate that the device is assembled from different parts or is rebuilt in an artisanal manner.

Check the status of the device on the official Xiaomi website or through the IMEI verification services. You should be interested in whether the phone is wanted, whether it is not blocked by the operator (especially relevant for versions from China or the United States), and when the warranty expired.

It is also important to check whether the phone will be reflashed to the global version with the Chinese version (Global). ROM on CN Hardware: These devices often lack important ranges LTE (Band 20), which impairs communication in rural areas, and may have trouble with notifications. MIUI There should be no Beta or strange symbols.

⚠️ Note: If the phone requires you to enter a password from the previous owner's Mi Account, the transaction must be terminated immediately.

Unblocking the bootloader and accounts

For many Xiaomi users, it is important to be able to unlock the bootloader to install custom firmware. If you plan to do this, be sure to ask the seller if Bootloader is unlocked. You can do this in the Mi Unlock app on your PC or by looking at the status in Settings → About Phone → MIUI version (you need to click on the version number several times).

If the bootloader is unlocked, it's not bad, but it requires understanding the risks. However, if the seller says, "Everything works, but it's better not to go into the settings," it's a wake-up call. It may have been locked up by the operator or stolen, and unlocking it is an attempt to cover up the tracks.

Be sure to ask the seller to log out of all accounts: Google, Mi Account, and remove the device from the trusted list. After resetting to factory settings (Settings → Advanced Settings → Restore and Reset), the phone should start as new, suggesting you choose a language rather than requiring a password.

• 🔓 Make sure there are no anti-thief apps installed in the Security menu.
• 🔓 Check if Find Device is enabled in your Google account.
• 🔓 Make sure that the phone is not listed in corporate management (MDM).

Resetting over the receptacles (Wipe Data) is the best way to check the cleanliness of the device. If after the reset the phone is locked and asks for an account that does not belong to you, you bought a brick. The real owner can always remove the device from the cloud remotely, but when you meet it is better to be safe.

Frequently Asked Questions (FAQ)

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Never buy a Xiaomi Redmi off hand if the seller refuses to do a full reset (Wipe Data) with you or claims that “Mi Account will be deleted in a couple of days.”