How to know exactly the year of release of Xiaomi device: from smartphone to smart watch

Have you bought a used Xiaomi smartphone and doubt the seller's integrity? Or want to check if you've been sold a device that's been in stock for years? Xiaomi's year of release is a critical parameter that affects firmware relevance, update support, and even market value. But how do you know if there's no explicit date on the box and that information is hidden in the system settings?

In this article, we will discuss 7 working ways to determine the production date of any Xiaomi device - from the flagship Mi 13 Ultra smartphones to the budget Redmi Note and Mi Band smart watches. IMEI You can also use official services to find hidden labels on the package, and you can also learn why the date on the battery sticker is not 100% accurate, and how sellers cheat on the secondary market.

1. Serial number check (S/N) — most accurate

Serial number (S/N) — It's a unique device identifier that contains encrypted information about the date of production. S/N It depends on the year of release and model, but the general logic of decryption is the same.

Where to find S/N:

• 📦 On a box - usually on a barcode sticker (example: SN: 9DLxxxxxxx)
• 📱 In the settings of the smartphone: Settings → The phone. → General information → Serial number.
• 🔋 Under the battery (for models with a removable lid) or on SIM-lot
• 🖥️ V MIUI Adb shell getprop ro.serialno

How to decipher:

Modern Xiaomi devices (c) 2018 yearly use of format S/N, where 4-and 5-The symbols represent the year, and 6-and 7-Y is a week of production:

• 📅 9DL2135xxxx → 2021, 35th week (late August)
• 📅 8GL1912xxxx → 2019, Week 12 (March)

⚠️ Note: Older models (before 2017) may have different formats. 3S year is encoded by the first digit after the letter prefix: MZB6xxxx → 2016.

2. Verification of IMEI — formality

IMEI (International Mobile Equipment Identity is another unique identifier that can be used to verify release dates, but not all services provide this information to Xiaomi, as the manufacturer does not always transfer production dates to global databases.

How to check:

1. Find out. IMEI device: 📱 Type on the keyboard: *#06# 📦 Look at the box (near the barcode) 🔋 Under the battery (for older models)
2. Check it out. IMEI on-site: 🌍 IMEI.info (paid check for Xiaomi) 🔍 SNDeeP (free, but not for all models) 📊 IMEI24 (partiality)

What do you know?

• 📅 Activation Date (not always the same as the production date!)
• 🏭 Producing country (China, India, Indonesia)
• 📦 Device model (e.g. Redmi Note 10 Pro instead of generalized) M2101K6G)

⚠️ Note: If the service shows the activation date before the production date (by serial number), this is a sign of forgery. IMEI Or broken firmware, which is what you do with stolen phones.

3.Date on box and stickers - where to look for hidden tags

Manufacturers often put a production date on the packaging, but not always in an obvious way. Xiaomi has a few places to find this information:

📦 The main barcode sticker:

• 🔢 MF DATE or MFG DATE — date-date YYYY-MM-DD or MM/YYYY
• 📌 Lot No. – a party number where the first 4 digits can represent a year and a week (e.g. 202135) → 2021, 35th week)

🏷️ Additional stickers (on the end of the box or under the film):

• 📅 Date in format YYMMDD (for example, 210815 → 15 August 2021)
• 🔤 A numeric code where the first pair of characters is a year (e.g., a year, VC21xx → 2021)

📦 The Redmi Note 11 Pro Sticker Decoding+:

⚠️ Warning: Stickers are easy to forge! If the date on the box is significantly newer than the serial number, this is a reason to doubt the authenticity of the device. POCO.

4. Verification through MIUI: Hidden menus and system information

If you have a Xiaomi smartphone on, you can try to find out the date of production through system settings or engineering menus, which does not work on all models, but sometimes gives accurate results.

🔧 Method 1: "About the telephone»

1. Open the Settings. → The phone. → General information
2. Find the fields Date of production or Hardware info
3. Click several times on the version MIUI — Sometimes it opens a hidden menu with more information.

🔧 Method 2: Engineering menu (power users only!)

1. Type on the keyboard: ##4636##
2. Go to the tab Phone Information
3. Scroll down to the Hardware block – sometimes there’s a build date there

🔧 Method 3: Through ADB (advanced)

If you have access to a computer, you can use the command:

adb shell getprop ro.boot.ddr_info

In the answer, look for a line of view manufacture_date=20211015 (15 October 2021 year-end).

⚠️ Attention: Not all teams ADB Don't use fastboot or commands from erase/flash, If you do not understand their actions, it can lead to a device blink.

💡

If there is no production date in the engineering menu, try installing the DevCheck app – it shows advanced hardware information, including build date (if available).

Verification by device model - databases and catalogs

If the serial number is erased and the box is not, you can try to determine the year of release by model code. Xiaomi has a clear naming system, where the first digits often indicate the year:

Where to check the model code:

• 📱 In settings: Settings → The phone. → Model (e.g, M2102J2SC)
• 📦 On a box (usually under a barcode)
• 🔋 Under the battery or on a sticker SIM-lot

How to decipher:

• 🔢 First 2 digits after letters - year (for example, M2102J2SC → 2021)
• 📅 The following 2 digits are a month (for example, M2102J2SC → February)
• 🏭 The last symbols are a modification for the region (e.g. C for China, G for global version)

For cross-checking, use the databases:

• 🌍 Kimovil - catalog with announcements and release dates
• 📊 GSMArena – the history of models by year
• 🔍 Xiaomi Firmware Updater – the link between model code and firmware

💡

If the model code starts with 20xxxx, But the serial number is 2022, and you're either a fake or a replacement motherboard device.

6. Checking by firmware and assembly date MIUI

Firmware version MIUI It can indirectly indicate the year of release of the device, for example, if the smartphone is MIUI 12.5, but the serial number it released in 2023 is a cause for doubt (because the number is not available). MIUI 12.5 is out in 2021).

How to check:

1. Open the settings → About the phone → version of MIUI
2. Remember the version (for example, 14.0.5.0.TKLCNXM)
3. Decode it by table:

Where to find the update history:

• 📅 Official website MIUI — archive
• 🔍 Xiaomi Firmware Updater – Release Dates

⚠️ Attention: If the version MIUI older than the serial number production date, this may mean: - The device was in stock and updated before sale - The firmware was pumped out manually (for example, to circumvent restrictions) - You have a fake firmware from another device

7.Checking Xiaomi smart watches and fitness bracelets

For wearables (Mi Band, Mi Watch, Redmi Watch), the methods of verification are different, where the serial number often does not contain a date, and the box may not have explicit labels.

🕒 Method 1: Through the Mi Fitness/Zepp app

1. Connect the device to the application
2. Go to the Device Profile → Settings → About the device
3. Find the Serial Number or Hardware version fields

📦 Method 2: Code on a box

• 🔢 Look for the mark. DATE CODE or LOT NO format YYMMDD (for example, 210915 → 15 September 2021)
• 🏷️ The sticker on the back of the box may contain a date in format MF DATE: 2022-11-05

🔋 Method 3: Marking on the device

• 🕰️ On the back of the Mi Band or Mi Watch, look for an engraving with a date in the format WYYWW: W2235 → 2022, 35th week
• 🔍 Use a magnifying glass – the date can be engraved in very fine print

📊 Example: Xiaomi Mi Band 7:

• 📦 On the box: DATE CODE: 220610 → 10 June 2022
• 🕰️ On a bracelet: W2225 → 2022, Week 25 (June)
• 📱 In Appendix: Hardware version: 1.0.6.56 (corresponding to firmware June 2022)

💡

If the date on the bracelet and box differs by more than 2 months, this could mean that the device has been in storage for a long time or has been repackaged.

FAQ: Frequent questions about Xiaomi release date