How to check the release date of the Xiaomi Redmi phone: a step-by-step guide

Buying a Xiaomi Redmi smartphone in the secondary market or even in an official store sometimes turns into a lottery: sellers can hide the real age of the device, and the box does not always contain reliable information. The release date of the phone is critical to assessing the residual battery life, support for updates and even market value. For example, the Redmi Note 10, released in early 2021, can lose up to 30% of battery capacity by 2026 – and this is the norm for lithium-ion batteries.

In this article, we will discuss 5 working ways to determine the production date of Xiaomi Redmi – from the analysis of the serial number to the hidden menu of the engineering mode. We will pay special attention to the common myth about the first two digits. IMEI" — Why this is often misleading and how to avoid mistakes. Instructions are suitable for all models in the series: from the budget Redmi A2 up to the flagship Redmi K60 Pro.

Serial number (SN) testing is the most reliable method

The serial number is a unique device identifier that encodes the release date, factory number and other data. Xiaomi has a standardized SN format, and its decryption gives accurate information about the month and year of production.

To find the serial number:

• 📱 Go to Settings. → The phone. → General information (on some firmwares, the path may differ: Settings → System system → The phone. → Version. MIUI).
• 🔍 Scroll down to "Serial Number" (or Serial Number).
• 📝 Write down or copy the combination – it will be needed to decrypt it.

Xiaomi serial number format (for devices after 2018): ABCD12345678, where:

• A is the factory code (e.g. H for Huizhou, C for Changsha).
• BCD is the year and month of release. For example, 9F5 stands for 2019, May (where 9 = 2019, F = 5th month on the hexadecimal system).
• 12345678 is a unique serial number of the device.

For convenience, use the table of correspondence:

⚠️ Note: On Xiaomi devices released before 2018 yearly format SN It might be different. 4X (2017) The date is coded differently: the first 4 The symbol is a week and a year (for example, a year, 7351 = 35-I'm a week. 2017 year-end).

2.IMEI Analysis: Why This Method Is Often Wrong

IMEI (International Mobile Equipment Identity) is another unique phone identifier, but its connection to the release date is often exaggerated. The myth that the first 6 digits of IMEI indicate the month and year of production is common on the Internet, in fact, it is a model certification code (TAC), which is issued to the manufacturer in a package and can refer to a whole batch of devices released within a few months.

How to check for IMEI:

• 📞 Dial on the phone keyboard *#06# - a window will appear with IMEI.
• 📄 Look at the sticker under the battery (if removable) or on the box.
• 🔧 In settings: Settings → The phone. → Status SIM-map.

Example of IMEI decoding for Redmi Note 11:

• IMEI: 869532041234567
• The first 8 digits (86953204) are TAC-code that can be checked on sites like imei.info, but the date in the search results will indicate the date of certification of the model, not the specific device!

Serial number | By IMEI|By box |By settings |I'm not checking-->

⚠️ Note: Some vendors are forging stickers with IMEI Always check the number with the data in the phone settings. IMEI The box and the system do not match - this is a sign of fraud or replacement of the motherboard.

3.Date on box and stickers: where to look and what to believe

The original Xiaomi Redmi box contains a few dates, but not all of them indicate the device's production.

• 📦 Date of production on the sticker (usually in format) YYYY-MM-DD or MM/YYYY). Look for her:
• 🏭 Batch code – often indicated next to a barcode in format WXXYY, where:

Example of the sticker on the Redmi 9A box:

M2006C3LG (model)




SN: 123456789ABCD




IMEI: 869532041234567




Made in India




2020-07-15 (Date of production)

But there are nuances:

• 🔄 The box could be replaced (especially if the phone was bought with hands).
• 📦 The date on the box may indicate the date of packaging, rather than the phone's production (up to 1-2 months difference).
• 🌍 Devices assembled in different countries (India, China, Indonesia) may have different labeling formats.

IMEI match on sticker and settings | Date format (should be YYYY-MM-DD) | Hologram and factory seals | Batch code next to barcode-->

4. Hidden menu of engineering mode: how to find out the date without disassembly

Hidden in MIUI's firmware are engineering menus that can find data on the date of production, the time of first activation, and even the number of battery charge cycles, which are not edited and stored in non-volatile memory.

Instructions for access:

1. Open the Phone app and type in the code ##4636## (some models may require #284### code).
2. In the menu that appears, select "Battery Information".
3. Look for lines: manufacture date - battery production date (YYYYY-MM-DD format), first use date - the date of the first activation of the phone (may not be available).

Example of data for the Redmi Note 10 Pro:

Battery health: Good




manufacture date: 2021-03-12




first use date: 2021-04-05




charge cycles: 312

⚠️ Warning: Battery production date may differ from phone assembly date by 1-3 months (batteries are supplied separately).If the difference is more than 6 months, this is a reason to doubt the originality of the battery.

Alternative way (for advanced users):

• 🔧 Install the app MTK Engineering Mode (for MediaTek processor devices) or Qualcomm Engineer Mode (for Snapdragon).
• 📊 Go to the Hardware Testing section → Device Information.
• 🔍 Look for the Manufacture Date settings or RF Calibration Date (calibration date of a radio frequency module, often coincides with the date of production).

💡

If the engineering menu does not open, try entering the code through the Calculator application: dial ===3845#*4636#=== (space-free) and press "=". This method works on some versions. MIUI.

5. Check by batch number (batch code) on the Xiaomi website

Xiaomi provides an official tool for authenticating devices by batch code, which works for most models released after 2019.

How to check:

1. Find the batch code on the box or under the battery (format: 12-14 characters, for example, K78AB12345678).
2. Go to mi.com/global/verify.
3. Enter the code in the "Batch Code" field and pass the captcha.
4. The system will show the date of production, model and region of the device.

Example of results:

Model: Redmi Note 11 Pro 5G (vega)




Manufacture Date: 2022-06-15




Region: Global




Authentication: Genuine Xiaomi Product

Limitations of the method:

• 🌐 The Site may not support certain regional models (e.g., those intended for China only).
• ⏳ Data does not appear in the database immediately – if the phone was released less than a month ago, the information may not be available.
• 🔄 Batch code can be forged (especially on fake boxes). Always check it against the sticker under the battery.

💡

Official verification on Xiaomi’s website is the only way to verify the authenticity of the device, and if the site produces an error called “Invalid Batch Code,” it’s a sign of a counterfeit phone or a fake box.

6. Indirect signs: how to determine the age of the phone without technical data

If none of the above methods worked (for example, stickers are erased and the engineering menu is blocked), pay attention to indirect signs:

• 🔋 Battery status: Go to Settings → Battery → Battery status: If the capacity is below 85% of the nominal capacity, the phone is older than 2 years (when used actively).
• 📱 Version. MIUI: Outdated versions (e.g, MIUI 11 in 2026) say the phone hasn't been updated in a long time. Check the site's update support MIUI Updates.
• 🛠️ Physical wear: Yellow screen (especially on the screen) AMOLED-displays - a sign of aging of organic materials (3+ Erased volume/power buttons – heavy use for 1.5–2 years.
• 📦 Chargers older than 2021 have a capacity of 10-18 W, new models (2022)+) — 33 watts and above. Headphones complete (if any) with a 3.5 mm connector are indicative of the model until 2020 (the new Redmi often excludes them).

Example: if the Redmi Note 9 Pro has a battery capacity of 78%, MIUI 12.5 firmware (the last update is 2022), and the charge is 18 watts, then with a high probability the phone is released in 2020-2021.

⚠️ Note: Some vendors reset the battery charge cycle meter through the engineering menu. Check the battery production date (see section 4) - if it is newer than the phone release date, this is a sign of battery replacement.

FAQ: Frequent questions about the release date of Xiaomi Redmi