Sell Xiaomi? 10 mandatory steps before a deal - from resetting to battery check

Selling a Xiaomi smartphone is not just a matter of price, but also a matter of security, device reputation and legal integrity. Even if you have used your phone carefully, without proper preparation, you run the risk of problems ranging from leaking personal information to claims of hidden defects. For example, an incomplete reset can leave your account in your device’s memory, and an untested battery can cause conflict after the sale.

In this article, we will explore the unique nuances of Xiaomi smartphones’ preparation for sale that are often overlooked: from the hidden features of the MIUI to checking the originality of components. You will learn how to avoid typical mistakes (for example, why you can not just take out the SIM- card and give the phone away), which documents must be saved, and how to check the device for locking through Find Device. And also how to present the phone so that the buyer does not bargain and not look for reasons for return.

1. Data backup: what to save and what can be deleted

The first step is to transfer important information from your phone, and even if you think there's nothing valuable in it, check:

• 📸 Photos and videos: they can be stored not only in the gallery, but also in the folders of messengers (WhatsApp, Telegram) or cloud services (Google Photos, Mi Cloud).
• 📱 Contacts and messages: export them to a.vcf file or sync them to an account Google/Mi.
• 🎮 Game Save: Many games (such as Genshin Impact or PUBG Mobile) are linked to an account, but some data is stored locally.
• 📝 Notes and documents: Check out Mi Notes, WPS Office, or Google Docs apps.

To back up in MIUI, go to Settings → About Phone → Backup and Reset → Local Backup. Alternatively, use Google Drive (Settings → Accounts → Google → Synchronization). Important: After copying, check the integrity of files on another device – sometimes the process is interrupted due to a lack of memory.

💡

If you have a model with a IR- blaster (e.g. Xiaomi 11T Pro or Redmi Note 10), export the remote settings to the file via the Mi Remote application. They cannot be restored after resetting!

⚠️ Warning: Don't rely on cloud services alone! Deleting your Mi Account after a reset may result in loss of access to backups in Mi Cloud.

Accounts Untie: Why it’s Not Enough to Just Leave Your Profile

Many users think that it is enough to log out of the Google and Mi Account in the settings, which is a dangerous misconception: even after the exit, data can remain tied to the device.

• 🔒 Mi Account: If not untie correctly, the new owner may face lockdown via Find Device (similar to Apple’s iCloud Lock).
• 📧 Google Account: Without deleting the device, it will remain on myaccount.google.com’s trusted list, putting the data at risk.
• 💳 Payment services: Google Pay, Mi Pay, or banking applications may retain authorization tokens.

To completely unplug accounts:

1. Delete all accounts in Settings → Accounts (click on each and select Delete Account).
2. For Mi Account, go to account.xiaomi.com, select the device under Device Management and click Untie.
3. Check that the phone has disappeared from the list in Google Find My Device.

A feature for models with MIUI 14+: after deleting the Mi Account, the system can request a password when it first turns on. To avoid this, reset after detaching the accounts.

3.Reset to factory settings: hidden nuances of MIUI

Resetting through Settings → About Phone → Resetting seems simple, but MIUI has pitfalls:

• 🔄 Incomplete reset: If you select Reset Settings rather than Erase All Data, your personal files will remain in memory.
• 📱 Reset Protection: Some models (e.g., POCO F3 or Redmi K40) require a password from Mi Account after reset, even if the account is untied.
• 🗃️ Residual data: Photos, videos, and documents may remain in the MIUI/Backup or DCIM/.thumbnails folder.

The correct algorithm:

1. Open Settings → About Phone → Backup and Reset → Erase all data.
2. Select “Clear internal memory” (if you have an option).
3. After reset, do not connect to Wi-Fi or SIM- card – turn off the phone immediately to avoid automatic activation of services.

Make sure the phone requests a setup as new|Check that there are no folders with personal data in the memory (for example, Download or Pictures)|Try to enter the Settings → Accounts – the list should be empty|Turn on the phone in safe mode (click the power button) → «Safe mode") and check for viruses-->

⚠️ Warning: On models with MIUI 13 and older, the application cache may remain in the /data folder after reset. To delete it, go to Settings → Storage → Clear the cache before reset.

4.Battery check: how to avoid buyer claims

Battery condition is one of the biggest factors affecting the price, and customers often check it through AccuBattery or ##4636##, and if the numbers are bad, they trade or they drop the deal.

• 🔋 Check charging cycles: MIUI does not have a built-in meter, but you can use the Battery Guru app (showing real capacity in mAh).
• ⚡ Fast Charging Test: Connect the original power supply and check if the charging speed reaches the stated values (for example, 33W for the Redmi Note 11 Pro+).
• 📊 Battery Log: in Settings → Battery → Battery Status See Discharge Schedule for the Last Day.

Normal performance for Xiaomi battery (depending on the age of the phone):

If the capacity is below 80%, honestly warn the buyer or replace the battery. the cost of a replacement at the Xiaomi service center is from 1,500 to 3,000 rubles (depending on the model).

Once a month | Only before selling |Never |I don't know how to do it-->

5. Original Testing: How to Recognize a Fake or Repair

Xiaomi is a popular brand among scammers who sell phones with replaced components (screen, battery, motherboard) to avoid cheating when selling:

• 🔍 IMEI: check it with *#06# and check it with the number on the box and in Settings → Phone → General information. If it doesn't match, the phone was opened.
• 🛠️ Repair marks: inspect the screws on the back cover (the original has no scratches) and check the tightness (on the protected IP53/IP68 models).
• 📱 Firmware: in Settings → About Phone → The MIUI version must be an official global or Chinese firmware (e.g., V14.0.4.0.TKCCNXM for Redmi K50).

To check the originality of the components:

1. Download the CPU-Z app and compare the CPU, memory, and screen data to the official model specifications.
2. Enter the IMEI on imei.info – the model and year of release must match.
3. Check the serial number on the Xiaomi website (link) – if the phone is not original, the system will show an error.

⚠️ Warning: The POCO and Black Shark models often have fake batteries with low capacity. Check it through AIDA64 (Battery section → Technology) The original battery must be from the Sunwoda manufacturer or ATL.

6.Preparation of documents: what is necessary for legal sale

Without the right documents, the deal could be invalidated and you could be charged with selling a stolen phone.

• 📄 Check or warranty card: Proves legal origin. If there is no check, a bank statement (if you bought by card) or a screenshot from the Xiaomi Store will do.
• 📱 Box and trim: original packaging increases the cost by 10-15%. Make sure that the box has all the accessories (cable, power supply, tray clip SIM).
• 🔄 Deed of Transfer: Make a simple document with IMEI, serial number, date of sale and passport details of the parties.

If the phone was bought on credit or lease, make sure it is fully redeemed and not listed in the collateral registry. Check this through the service of the Loan Register (enter IMEI).

💡

Without a check or transfer deed, the buyer can demand a refund if the phone is blacklisted (for example, IMEI blocked by the operator).

A feature for Xiaomi: if the phone is imported from China (the CN-suffixed model in the name), it may not have an official warranty in Russia.

7. Appearance assessment: how to present a phone more expensive

Even a technically-functioning phone can be sold for less because of scratches, scuffs or dirt.

• 🧼 Clean: Use a microfiber wipe and alcohol (70%) for the screen and body, for speakers and connectors, toothpick or compressed air.
• 🎨 Scratch Removal: Small scratches on plastic can be masked with polyrele for phones (e.g., Displex). Glass - paste GOI.
• 📸 Advertising photos: Take pictures in good light, showing:

- Screen (on and off)




- All sides of the hull.




- Tray SIM- maps




Type-C port and speakers




- Serial number on the box.

An example of a good description in the ad:

"I'll sell the Xiaomi 12T Pro 12/256GB in perfect condition. The phone was bought from the official Xiaomi store, the check is saved. Battery - 98% capacity (checked through AccuBattery), no scratches on the screen (the original glass, no replacements). Included: box, cable, power supply 120W, case and film. Warranty until 12.2026."

💡

If the phone has chipped on the screen but the sensor is working normally, list it as "minor defects" in the ad. This is better than hiding it, the customer will still notice on inspection.

8.Safe Deal: How to Avoid Fraud

Fraudsters often use prepaid schemes, fake bank checks or "phone checks." Safe selling rules:

• 💵 Cash or card transfer at a meeting: do not agree to an advance payment or transfer via Qiwi/YMoney (cancelled).
• 📍 Meeting place: Choose crowded places (for example, communication salons or MTS, where there are surveillance cameras).
• 🔍 Money Check: If you take cash, use a currency detector or the US Banknotes app to check bills.
• 📱 Buyer phone test: Allow to check IMEI, battery and camera, but don't give the phone away without paying.

Typical schemes of deception:

⚠️ Warning: If a buyer insists on meeting in an unfamiliar place or asks for your passport "to check out," this is an excuse to withdraw from the deal.

FAQ: Frequent questions before selling Xiaomi