How to accurately determine the date of production of the Xiaomi phone: all methods with examples

Did you buy a Xiaomi smartphone from hand or at a sale, but doubt its real age? Or do you want to check if you sold it under the guise of a "new" device that has been dusting in stock for years? The date of production of the phone is a critical parameter that affects warranty life, battery wear and even market value. Unfortunately, the manufacturer does not always specify this information in the settings, and sellers often hide the real age of the device.

In this article, we will look at all the current ways to find out the release date of Xiaomi, from official methods (via the serial number and IMEI) to little-known life hacks (analysis of firmware and hardware tags). You will learn what data can be trusted 100% and where you can be deceived. Instructions are suitable for all lines: Redmi Note 12, POCO X5, Mi 11 and even old models like Redmi 4X.

1. The most accurate method: decoding the serial number (S/N)

The serial number (S/N) is a unique device identifier that Xiaomi assigns to each smartphone during production, encodes not only the release date, but also the factory, batch, and sometimes even the color of the case, and the main advantage of the method is that data from the serial number cannot be forged programmatically, unlike information in the firmware.

Where to find the serial number:

• 📦 On the box – usually on a barcode sticker (look for a line "S/N" or "Serial No").
• 📱 In the phone settings: go to Settings → The phone. → General information → Serial number.
• 🔋 Under the battery (for models with removable battery, for example, Redmi). 3S).
• 🖥️ Through ADB (For advanced users: connect your phone to your PC and type in the command: adb shell getprop ro.serialno

Xiaomi serial numbers have a standard format: XXXXXXXXXYYWW, where:

• XXXXXXXXX — unique code.
• YY is the year of production (e.g., "20" = 2020).
• WW is the week of production (from "01" to "52").

Example: Serial number 8QD91234567890 does not contain an explicit date, but if you see the format 8QD9123452045, then:

• Last 4 digits: 2045 → 20 (year) + 45 (week).
• Release: November 2020 (week 45).

⚠️ Note: Starting in 2021, Xiaomi began using a new serial number format without an explicit date. №2 (IMEI) or №3 (firmwareware).

2. IMEI Verification: Online Services and Hidden Data

IMEI (International Mobile Equipment Identity) is another unique identifier that can be used to determine the date of production. Unlike the serial number, the IMEI is tied to the phone's communication module and contains information about the manufacturer.

How to find out IMEI:

• 📞 Dial on the phone keyboard *#06# - a window with a 15-digit code will appear.
• 📄 In settings: About the phone → General information → IMEI.
• 📦 On the box or under the battery (for older models).

The IMEI consists of 15 digits where:

• The first 8 digits (TAC) are the model and manufacturer code.
• The next 6 digits (SNR) is the serial number of the device where date data can be encrypted.
• The last figure is the checksum.

To decipher the date:

1. Go to IMEI.info or IMEI24.
2. Type in your IMEI and get a report. Look for the lines "Manufacturing Date" or "Production Date."

⚠️ Note: Online services may show an inaccurate date for new Xiaomi models (2022 and later) as the manufacturer changed the coding format IMEI. In this case, cross-checked data with a serial number or firmware.

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If IMEI starts with 86, it means the phone is made in China, and if it starts with 35 or 01, it indicates the European/global version.

3. firmware analysis: hidden tags in the system

MIUI firmware contains hidden data about the date of the device's assembly, which is suitable if you don't have a box or stickers and the serial number is in a new format, minus: data can be forged by flashing, but for most users, the method remains reliable.

Instructions:

1. Open the settings → About the phone → version of MIUI.
2. Tap the “kernel version” line (or “build number”) several times until the developer menu appears.
3. Back to Settings → Additionally. → For developers.
4. Find the item "Band Version" or "Baseband Version." This may be the date in YYYY.MM.DD. format.

Examples for the Redmi Note 10 Pro:

• Baseband: M2101K6G_RU_20210315 → build-date 15 March 2021 year-end.

The date can also be found in the system logs:

Install ADB on PC|Plug your phone in debugging mode|Put in adb shell getprop ro.build.date|Receive date in Mon Jun 12 14:25:30 CST 2023

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Note that the firmware date may indicate the date of the software build, rather than the phone production, and the difference is usually 1-3 months (testing and logistics time).

4.Physical inspection: where to look for date on case and battery

If you have a Xiaomi model with a removable back cover (e.g. Redmi 4A, Mi A1), the production date can be found directly on the body or battery, which is 100% reliable, since the data is deposited with a laser during the assembly phase.

Where to look:

• 🔋 On the battery – usually a sticker with a date in the format YYYY-MM-DD or WW-YY (week-year).
• 📱 Under the battery – the board may be engraved with the test date.
• 📡 On the antenna module (for old models) - small font with the batch code.

Example of marking on the battery Redmi Note 5:

• 2018-05-12 → produced on May 12, 2018.
• 18W20 → Week 20 of 2018 (May 2018)

⚠️ Note: On newer models (2020 and later), the date on the battery is often replaced with the batch code.

5. Check by batch number (Batch Code) on the box

The original Xiaomi box always has a batch code sticker that contains information about the date of production and the country of manufacture, which works for all models, but requires knowledge of the coding format.

How to decipher Batch Code:

• The party number is usually as XXXXX-YY-WW, where:
• YY is the last two digits of the year (e.g., "21" = 2021).
• WW is the week of production (from "01" to "52").

Examples:

• M2007J22CG-21-30 → 30th week of 2021 (July 2021).
• 2201116TI-20-15 → Week 15, 2020 (April 2020)

If the format is not obvious, use the date calculator:

1. Take a picture of the sticker from the box.
2. Upload the photo to BatchCode.net.
3. Choose the Xiaomi brand and get a transcript.

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If the box doesn't have the Batch Code or it's erased, check for the hologram and the barcode. Fake boxes often have blurred stickers or typos in the serial number.

6. Alternative methods: when nothing helps

If none of the above methods worked (for example, you have custom firmware or erased stickers), try these options:

• 📊 Check through Mi Account: Log in to account.xiaomi.com. Go to Devices" → In some cases, the activation date is displayed here (not to be confused with the production date!).

Analysis of hardware components

• Install the AIDA64 or CPU-Z app.
• Check the release date of the chipset (Section "SoC" or "Processor").
• Compare this to the date of the announcement of the model on GSMArena.

Consultation in the service center

Xiaomi’s official SCs can check the date by internal databases if provided IMEI or purchase check. Service paid (from 500 ₽).

For POCO and Black Shark models, a unique method sometimes works:

⚠️ Note: If the production date for all methods differs by more than one 3 In the month, it is likely that the phone: 🔄 Formerly in repair (replaced fees). 📦 Repackaged (box from another device). 🛠️ Fake. IMEI/Serial (check through IMEI.info).

FAQ: Frequent questions about Xiaomi's production date