Have you bought a used Xiaomi and questioned the seller's integrity? Or want to check if you've been sold a "cat in a bag" under the guise of a new device? The year of release of a smartphone is a critical parameter that affects battery life, update support and even market value. For example, the Redmi Note 10 Pro of 2021 can cost 30% less than a similar model 2023 - with external identity.
The problem is that Xiaomi (unlike Apple or Samsung) doesn’t always have a transparent production date, there may be no explicit label on the box, and there may be a special item in the system settings, but there are 5 working methods to calculate the age of the device to within a month. In this article, step-by-step photo instructions, decoding hidden manufacturer codes, and warnings about common counterfeits (for example, when sellers replace stickers on boxes).
1. Serial number check (S/N) — most accurate
The serial number is a unique identifier that Xiaomi assigns to each device during the manufacturing phase, encrypting the year, month, and even the factory where the phone is assembled.
- 📦 On the box – usually on a barcode sticker (look for a line) S/N or Serial No.).
- 📱 In the phone settings: Settings → The phone. → General information → Serial number.
- 🔋 Under the battery (for models with a removable lid, for example, Redmi) 4A).
- 🖥️ Through ADB (If the phone is not turned on: connect to the PC and enter the command adb shell getprop ro.serialno
Xiaomi serial number usually has a format XXXXXXXXXYYYY, where:
- XXXXXXXXX — unique code.
- YYYY — year and month of production in the format of HGMM (for example, 2103) = March 2021).
Find a line. S/N box-boxed
Select the last 4 digits (example: 2211)
Break them into two pairs: 22 | 11 → 2022, November
Check the model release date (see table below)-->
Some models, for example, POCO F3 Mi 11 Ultra can use a different format. If the last 4 digits don't fit the logic, try an alternative method.
⚠️ Warning: Fraudsters often forge stickers on boxes, replacing serial numbers. S/N If you don't have the same settings, you've got a repackaged or refurbished machine.
2. Analysis. IMEI: when the serial number is not available
If the serial number is erased or the phone is not turned on, use IMEI — International mobile device identifier, which can be recognized:
- 📞 By typing on the phone keyboard *#06# (a window with a 15-digit code will appear).
- 📄 On the box or under the battery (for older models).
- 🖥️ Through ADB: adb shell service call iphonesubinfo 3
First 8 digits IMEI (TAC-The code contains model and certification date information, which can be decrypted on sites like IMEI.info or IMEI-Number.com. IMEI The model does not show the date of production, but the date of certification of the model (usually 2-6 months before the actual release).
Example: Xiaomi Redmi Note 10 Pro with IMEI 863724051234567 TAC-The code is 86372405, and the test will show that the model is certified in November 2020, although it went on sale only in March 2021.
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If IMEI It starts at 86, it's made in China, it starts at 35, it's Europe or India, and it doesn't affect the date, but it can help identify the "gray" imports.
3. Production date on the box: where to look and how not to make a mistake
On the original Xiaomi boxes, the release date is listed in one of three places:
- Barcode sticker - look for a line MFG Date (e.g., Date, 2022-11-15).
- Typographic code at the bottom of the box - format YYMMDD (case: 221115 = 15 November 2022).
- The serial number of the box - sometimes duplicates S/N telephone (see section) 1).
Pay attention to the format of the print:
- 🔹 Laser printing is a sign of the original.
- 🔹 Flush or blurred - a possible fake.
- 🔹 Sticker over the sticker - 100% repackaging.
| Xiaomi model | Typical date format on the box | Example | Notes |
|---|---|---|---|
| Redmi Note 9/10/11 | YYMMDD bottom-box | 210315 (15 March 2021) | Sometimes duplicated on a barcode sticker |
| POCO X3/F3 | MFG Date: YYYY-MM-DD | 2021-07-20 | It may be hidden under a protective layer. |
| Mi 11/12 Series | Box serial number. = S/N phone | 220912345678910 | The Last 4 Figures - GGMM |
| Redmi A1/A2 | Only YYMM sticker | 2211 (November 2022) | The date of production is not specified. |
⚠️ Note: On Xiaomi boxes for the European market (marked) CE) The date may be specified in the format DD/MM/YYYY, and Asian (CCC) — YYYY/MM/DD. Don't confuse month and day!
Looking at the box.
Using the serial number.
Checking on IMEI
Trust the salesman.
Not checking.-->
4. Hidden engineering codes: for advanced users
If the phone is turned on, but no serial number, IMEI They don't give a clear answer, use service codes. They work on most Xiaomi models (except the newest ones on HyperOS):
- 📅 Production Date: Enter ##4636##, go to Phone Information → Assembly date (format: MM-DD-YYYY).
- 🏭 Factory data: ##284## (will show the assembly country and the batch).
- 🔧 Full diagnosis: ##6484## → Version info → Manufacture date.
On some firmware (e.g, MIUI Global) these codes can be blocked:
- Install the app MTK Engineering Mode (for MediaTek processors) or Qualcomm Service Mode (for Snapdragon).
- Go to Hardware Testing → Version.
- Find the Manufacture Date line or RF Cal Date (calibration date of radio module, usually the same as the date of assembly) ±1 month).
What do I do if the codes don't work?
5. Verification according to firmware version and updates
Even if you didn’t find physical marks, the version MIUI And the date of the last update can tell you the age of the phone. → The phone. → Version. MIUI And pay attention:
- 📌 Assembly number (e.g, V12.5.4.0.RKFMIXM). Last letters (MIXM) The region and version are: M is global (Global). C is China. R is Russia. I is India).
- 📅 Assembly date - in format YYYYMMDD (for example, 20221115 = 15 November 2022).
- 🔄 Last Update: If the phone was updated in June 2023 and the model came out in 2021, most likely, it was produced no earlier than 2022.
Contrast the firmware version with the official update table on the site MIUI For example, if your Redmi Note 9 Pro is running on the MIUI 14, but the last update for this model came out in May 2023, and the firmware build date is March 2023, the phone is likely made in the first quarter of 2023.
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The firmware is never older than the phone itself. MIUI — 2023, and the seller claims that the phone 2021, it’s a hoax.
6 Physical Signs: What the Age of the Phone Is
If digital methods don’t help, check your phone for indirect signs:
- 🔋 Battery: On models 2020-2021, capacity drops by 15-20% in 2 years. 2022+ — usually no more than 10% (thanks to improved charge controllers). → Battery → Battery status or AccuBattery application.
- 📦 Charges in 2021 and older – usually 18W (Charges in black, 2022+ — 33W+ (white or gray, with markings MDY-12-EX). Cables. USB-C Until 2020, the Xiaomi logo is often not on the connector.
- 🛠️ Body and buttons: Models 2019-2020 (like the Redmi Note 8 Pro) have a plastic body with a glossy coating that scratches quickly.Models 2021+ (For example, Redmi Note 10 Pro is a matte glass back panel. POCO F3 (2021) - red, on POCO F4 (2022 - black.
And look at the factory film.
- On phones in 2020 and older, it is usually matte and covers only the screen.
- Models 2022+ — glossy, often with back panel protection.
- If the film has already been filmed, but the phone looks new, this is a reason to doubt the honesty of the seller.
7. Online services for verification: pros and cons
There are several sites that promise to determine the date of production by serial number or IMEI. Here are the most popular:
| Service | Address | Checks | Reliability |
|---|---|---|---|
| IMEI.info | imei.info | IMEI, TAC-code, model | ⭐⭐⭐ (The date of certification is not the date of production) |
| SNEI.app | snei.app | Xiaomi serial number | ⭐⭐⭐⭐ (precise) |
| MIUI Versions | miuiversions.com | Firmware version and build date | ⭐⭐⭐⭐⭐ (Official data from Xiaomi) |
| CheckMEND | checkmend.com | IMEI, history | ⭐⭐ (Pay, data is not always relevant) |
Warning: Do not enter the serial number or IMEI Scammers can use this data to:
- 🚫 Unlock your phone (if it is linked to your Mi Account).
- 🚫 Switching IMEI on stolen devices.
- 🚫 Write-offs via paid subscriptions (some services automatically connect them).
Use only the proven resources in the table above. for added security, mask the last 2 digits IMEI when checking (for example, instead of 863724051234567 enter 86372405123456X).
Frequent Mistakes and How to Avoid Them
When determining the release year of Xiaomi, users often encounter traps:
- Fake stickers on boxes: 🔍 Check if the serial number matches on the box and in the phone settings. 🔍 Check the paint on the barcode under the magnifying glass - on fakes it is often smeared.
- Inconsistency of firmware and production date: 📅 The firmware may be newer than the phone (for example, if the previous owner has updated it manually). 📅 But she's never older, if the date of assembly is MIUI — 2020, and the phone supposedly 2022, it’s a hoax.
- Confusion in date formats: 📅 On Asian boxes format YYYY/MM/DD, European — DD/MM/YYYY. 📅 Xiaomi's serial number is always GGMM (year) + month, not vice versa!
"Rejuvenated" phones
- 🔧 Some workshops replace the battery, body and even motherboard, giving the old phone for a new one.
- 🔧 Check it out. IMEI in settings and on the box - if they are different, the phone is disassembled from several donors.
If you are buying a phone from hand, ask the seller:
- 📸 Photo of the box with the serial number before the meeting (to avoid substitution).
- 📄 Check or warranty card (even if the warranty is over, the document will confirm the date of sale).
- 🔋 Screenshot from AccuBattery with battery wear data.
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If the seller refuses to provide a serial number before the purchase, that's an excuse to refuse the deal, most likely, he's hiding something.